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Exchange Rate Mechanism - Calculations

June 17, 2023, 8:10 a.m.

Prof. SSN Murthy, ex Deputy General Manager, Union Bank of India

  • Where is the wholesale market of forex?
    • The wholesale market is also called as Inter-Bank market.
    • It lies in the dealing room of the Bank’s Treasury.
  • The transactions taking place between the banks or financial institutions are called as wholesale transactions or inter-bank transactions.
  • 1 $ = 82.44 – this is called as Average interbank rate.
  • 1 $ = Rs. 82.43/82.45
  • 1 $ = Rs. 82.43/45
  • Rs. 82.43 is called as Bank’s buying rate of Dollar or also called as Bid Rate.
  • Rs. 82.45 is called as Bank’s selling rate of Dollar or also called as Offer Rate or Ask Rate.
  • The Logic is Buy Low and Sell high, then only the trader can make profit. 
  • The difference between Buying Rate and Selling rate is called as Spread.
  • From the spread itself, we can come to know the depth of the market.
  • Our Market today:
    • 1 $ = 82.43/45, the spread is 2 paise.
    • $ is called as the Base Currency, it will never move. 
    • Rupee is called as the Variable Currency, because $ makes the rupee to go up and down. 
    • The WTO approved countries are about 190 in the world.  Nearly 95% of the countries follow $ as the base currency.
  • In Singapore the $ rate is:
    • 1$ = 1.3433/35 SGD, the difference is called as 2 pips.
  • In the inter-bank or wholesale market, the minimum marketable lot size is $ 5,00,000 or also called as $ 500th.
  • For example, Mr. X is exporter and has exported goods worth $ 200th 
    • B category branch where the exporter has got his account has securitized the export documents and it is in order.
    • Then What B Category will do:
  • B Category

  • Dealing Room

  • B Category will sell $ to the dealing room

  • Dealing Room will buy the $ from B Category

  • Any foreign exchange rate, we have to see from Dealing Room point of view;
  • What is today’s inter-bank rate:
    • 1 $ = 82.43/45.
    • As per the logic, we have to take the buying rate of dealing room, that is Rs. 82.43.
    • B category has to load some margin for the work carried out for the exporter.
    • Assuming, B Category loads a margin of 2 paise per $, then the export merchant rate would be:
    • Inter-Bank Rate is : Rs. 82.43
    • Less Margin:                     0.02
    • Export Rate is:         Rs. 82.41
    • How much rupee would be credited to the account of the exporter?
      • $ 200th x Rs. 82.41 = Rs. 1,64,82,000 would be credited to the exporter’s account.
    • What is margin or profit earned by bank in the export transaction?
      • Rs. 0.02 x $ 200th : Rs. 4,000/-

For example, Mr. Y is importer and importing some goods from abroad for $ 200th 

  • B category branch where the importer has got his account has securitized the import documents and it is in order.
  • Then What BCategory will do:
  • B Category

  • Dealing Room

  • B Category will buy $ from the dealing room

  • Dealing Room will sell the $ to B Category

  • Any foreign exchange rate, we have to see from Dealing Room point of view;
  • What is today’s inter-bank rate:
    • 1 $ = 82.43/45.
    • As per the logic, we have to take the selling rate of dealing room, that is Rs. 82.45.
    • B category has to load some margin for the work carried out for the importer.
    • B category is out of funds by Rs. 82.45
    • Assuming, B Category loads a margin of 3 paise per $, then the import merchant rate would be:
    • Inter-Bank Rate is : Rs. 82.45
    • Add Margin:                     0.03
    • Export Rate is:         Rs. 82.48
    • How much rupee would be debited to the account of the importer?
      • $ 200th x Rs. 82.48 = Rs. 1,64,96,000 would be debited to the importer’s account.
  • What is margin or profit earned by bank in the import transaction?
      • Rs. 0.03 x $ 200th: Rs. 6,000/-
  • Simple thumb rules:
    • For exporters or inward remittances:
      • Take the less rupee from the inter-bank quote.
      • Export or inward remittance margin is deducted.
      • Exporter’s rupee account is credited. 
    • For importers or outward remittances:
      • Take the higher rupee from the inter-bank quote.
      • Import or outward remittance margin is added.
      • Importer’s rupee account is debited. 
  • Let us do a problem:
  • Today’s inter-bank quote is: 
    • 1 $ = 81.92/94
  • Exporter has submitted export document for $ 500th. Margin to be loaded is 3 paise per $.
  • Importer has submitted import document for $ 400th. Margin to be loaded is 4 paise per $.

Your questions:

    • What is the inter-bank export rate?
      • 1 $ = Rs. 81.92
    • What is the merchant export rate?
      • 1 $ = Rs. 81.89
    • How of rupee would be credited to the account of the exporter?
      • Rs. 81.89 x $ 5,00,000 = Rs. 4,09,45,000
    • What is the inter-bank import rate?
      • Rs. 81.94
    • What is the merchant import rate?
      • Rs. 81.98
    • How of rupee would be debited to the account of the importer?
      • Rs. 81.98 x $ 400,000 = Rs. 3,27,92,000
    • What is the total margin earned by the Bank on the above two transactions?
      • On export: 0.03 x $ 500th: Rs. 15,000/-
      • On import: 0.04 x $ 400th: Rs. 16,000/-
      • Total margin earned: Rs. 31,000/-.
    • Cross Currency:
    • What is cross currency internationally?
      • In a currency pair, $ leg will be absent. 
        • 1 Euro = 150.02 Yen.
    • What is cross currency in India?
      • In a currency pair, rupee leg will be absent.
        • 1$ = 1.3433/35 SGD = also called as direct quote.
    • Some countries, they think they are superior to $.
      • 1 Euro = 1.0746/48 $, the difference is 2 pips = Indirect quote.

Next Problem

  • For example, Mr. X is exporter and has exported goods worth SGD 200th:
  • Today’s Forex rates are:
    • 1 $ = 81.92/94
    • 1$ = 1.3433/35 SGD
    • B category branch where the exporter has got his account has securitized the export documents and it is in order.
    • Then What B Category will do:
  • B Category

  • Dealing Room

  • Sell SGD and buy $

  • Buy SGD and Sell $

  • B Category will sell $ to the dealing room and buy rupee

  • Dealing Room will buy the $ from B Category and give rupee to B Category

    • Any foreign exchange rate, we have to see from Dealing Room point of view;
    • While doing exchange rate mechanism, it should be carried out from base currency perspective:
  • Dealing Room

  •  
  • Buy SGD and Sell $

  • 1$ = 1.3433/35 SGD

  • Dealing Room will buy the $ from B Category and give rupee to B Category

  • 1 $ = 81.92/94

    •  
  • 1 $ = 81.92 INR
  • 1 $ = 1.3435 SGD
  • We have to find out how rupee, the dealing room has to give to the exporter for 1 SGD.
  • 1.3435 SGD = Rs. 81.92
  • 1 SGD =?
  • Rs. 81.92/1.3435 SGD = Rs. 60.975 or Rs. 60.98
  • Less assuming a margin of:                            0.02
  • Exporter Merchant Rate:                       Rs. 60.96.
  • Rs. 60.96 xx SGD 200TH: Rs. 1,21,92,000 would be credited to the account of the exporter.
  • Margin earned by the Bank: 0.02 x SGD 200TH: Rs. 4,000/-.

Next Problem

  • For example, Mr. Y is importer and he is importing goods worth CAD 200th.
  • Bank is loading a margin of 3 paise per CAD.
  • Solution: 
  • Today’s Forex rates are:
    • 1 $ = 81.92/94
    • 1$ = 1.3338/40 CAD.
    • B category branch where the importer has got his account has securitized the import documents and it is in order.
    • Then What B Category will do:
  • B Category

  • Dealing Room

  • Buy $ and sell INR

  • Sell $ and buy INR

  • Sell $ and buy CAD

  • Buy $ and Sell CAD

    • Any foreign exchange rate, we have to see from Dealing Room point of view;
    • While doing exchange rate mechanism, it should be carried out from base currency perspective:
  • Dealing Room

  •  
  • Sell $ and buy INR

  • 1 $ = 81.92/94

  • Buy $ and Sell CAD

  • 1$ = 1.3338/40 CAD.

  • 1 $ = 81.94 INR
  • 1 $ = 1.3338 CAD
  • We have to find out how rupee, the dealing room has to recover from the importer for 1 CAD.
  • 1.3338 CAD = Rs. 81.94
  • 1 CAD =?
  • Rs. 81.94/1.3338 CAD = Rs. 61.43 or Rs. 61.43
  • Add assuming a margin of:                           0.03
  • Exporter Merchant Rate:                      Rs. 61.46.
  • Rs. 61.46 x CAD 200TH: Rs. 1,22,92,000 would be debited to the account of the importer.
  • Margin earned by the Bank: 0.03 x CAD 200TH: Rs. 6,000/-.

Next Problem: 

  • Today’s Forex rates are:
    • 1 $ = 81.92/94 (Direct Quote)
    • 1 GBP = 1.2571/73 $ (Indirect Quote)
    • 1 Euro = 1.0746/48 $ (Indirect Quote)
  • Exporter has submitted export bill for GBP 500th and margin to be loaded is 0.05% and you have to give 4-digit quote.
    • B category branch where the exporter has got his account has securitized the export documents and it is in order.
    • Then What B Category will do:
  • B Category

  • Dealing Room

  • Sell GBP and buy $

  • Buy GBP and sell $

  • Sell $ and buy inr

  • Buy $ and sell inr

    • Any foreign exchange rate, we have to see from Dealing Room point of view;
    • While doing exchange rate mechanism, it should be carried out from base currency perspective:

      Dealing Room

      •  
      • Buy GBP and Sell $

      • 1 GBP = 1.2571/73 $

      • Buy $ and sell inr

      • 1 $ = 81.92/94

  • 1 $ = 81.92 INR
  • 1 GBP = 1.2571 $
  • We have to find out how much rupee, the dealing room has to give to the exporter for 1 GBP.
  • 1 $ = Rs. 81.92
  • 1.2571 $ =?
  • Rs. 81.92 x 1.2571 $ = Rs.  102.9816
  • Less 0.05% =                             0.0515 (102.9816 x 0.05/100)
  • Exporter Merchant Rate:   102.9301                      
  • Rs. 102.9301 x GBP 500th: Rs. 5,14,65,050 would be credited to the account of the exporter.
  • Margin earned by the Bank: 0.0515 x GBP 500TH: Rs. 25,750/-.

Next Problem:

  • Importer has submitted import bill for Euro 500th and margin to be loaded is 0.05% and you have to give 4-digit quote.
  • Today’s Forex rates are:
    • 1 $ = 81.92/94 (Direct Quote)
    • 1 Euro = 1.0746/48 $ (Indirect Quote)
    • Then What B Category will do:

B Category

Dealing Room

  • Buy $ and Sell INR

  • Sell $ and buy inr

  • Sell $ and buy Euro 

  • Buy $ and sell Euro

  • Any foreign exchange rate, we have to see from Dealing Room point of view;
  • While doing exchange rate mechanism, it should be carried out from base currency perspective:
  • Dealing Room

  •  
  • Sell $ and buy inr

  • 1 $ = 81.92/94 inr

  • Buy $ and sell Euro

  • 1 Euro = 1.0748 $ 

  • 1 $ = 81.94 INR
  • 1 Euro = 1.0748 $
  • We have to find out how much rupee, the dealing room has to recover from the importer for 1 Euro.
  • 1 $ = Rs. 81.92
  • 1.0748 $ =?
  • Rs. 81.94 x 1.0748 $ = Rs.  88.0691
  • Add 0.05% =                           0.0440 (88.0691 x 0.05/100)
  • Exporter Merchant Rate:   88.1131                      
  • Rs. 88.1131 x Euro 500th: Rs. 4,40,56,550 would be debited to the account of the importer.
  • Margin earned by the Bank: 0.0440 x Euro 500TH: Rs. 22,000/-.
    • In forward contract, the rate difference arises out of interest rate differential.
    • Let us assume today’s average rate is 1 $ = Rs. 82/-
    • One year T.bill in US is available at the rate of 3%.
    • One year T.bill in India is available at the rate of 6%.
    • From the above input arrive at the year $/rupee parity.
    • Long cut:
      • (82 x 1 x 6)/ (100 x 365) = Rs. 4.92
      • (1 x 1 x 3)/ (100 x 360) = 1.03 $
      • From this, arrive at 1 $ rate: (82 + 4.92)/ (1.03)
      • 86.92/1.03 = Rs. 84.39 per $
    • Short cut: 
      • 82 x (1.06/1.03)
      • 82 x 1.0291 = Rs. 84.39 per $

Problem: 

    • Assume today is 5th May, 2023
    • One exporter wants to book a forward contract for his $ receivable on 30th April, 2024.  Assuming bank is loading a margin of 2 paise per $, what rate bank would quote for him?
    • Today’s Inter-Bank Rate: Rs. 81.71
    • Add premium for 30/04:         3.15
    • Interbank forward rate:  Rs. 84.86
    • Less Margin:                              0.02
    • Merchant Forward Rate:      84.84

Problem: 

  • One importer wants to book a forward contract for his $ payable on 29th February, 2024.  Assuming bank is loading a margin of 2 paise per $, what rate bank would quote for him?
    • Today’s Inter-Bank Rate: Rs. 81.73
    • Add premium for 29/02:         2.63
    • Interbank forward rate:  Rs. 84.36
    • Add Margin:                              0.02
    • Merchant Forward Rate:      84.38

       Next Problem: Broken delivery:

  • One exporter wants to book a forward contract for his $ receivable on 16th April, 2024.  Assuming bank is loading a margin of 2 paise per $, what rate bank would quote for him?
  • Today’s Inter-Bank Rate: Rs. 81.71
  • Add premium for 31/03:         2.88
  • Add premium 16/04:               0.14
  • Interbank forward rate:  Rs. 84.73
  • Less Margin:                              0.02
  • Merchant Forward Rate:      84.71
  • Problem: 
  • One importer wants to book a forward contract for his $ payable on 09th February, 2024.  Assuming bank is loading a margin of 2 paise per $, what rate bank would quote for him?

  • Today’s Inter-Bank Rate: Rs. 81.73
  • Add premium for 31/01:         2.36
  • Add premium 09/02:               0.08
  • Interbank forward rate:  Rs. 84.17
  • Adds Margin:                             0.02
  • Merchant Forward Rate:      84.19
  • Above are called as Fixed date deliveries. In case of fixed date deliveries, on due date some problem can arise, such as strike, lock out etc.
  • Exporters and importer approached FEDAI, which Self-regulatory organization.
  • So, FEDAI came out with an idea of booking forward contracts with option period.
  • FEDAI permits a maximum option period of 1 month.
  • Examples:
    • It can be full month February, 2024
    • It can be from 15/3/2024 to 14/04/2024
    • Within one month, booking can be done as follows:
    • 1/1/2024 to 10/01/2024
      • 18/2/2024 to 25/02/2024
    • Any forward contract with option period will have two legs:
      • One is called as early delivery.
      • Another is called late delivery.
    • In case, forward contract is booked with full month option period of say, March, 2024:
    • Early delivery will be 1st March, 2024
    • Late delivery will be 31st March, 2024.
    • In case of exporters, go for early delivery and for importers go for late delivery.

Problem:

    • One exporter wants to book a forward contract for his $ receivable on Full month April, 2024.  Assuming bank is loading a margin of 2 paise per $, what rate bank would quote for him?
    • What would be the early delivery: 1/04/2024
    • Late delivery would be: 30/04/2024.
    • So, in case of exporters go for early delivery that is, 1/04/2024
    • Today’s Inter-Bank Rate: Rs. 81.71
    • Add premium for 31/03:         2.88
    • Add for 1st April                         0.01
    • Interbank forward rate:  Rs. 84.60
    • Less Margin:                              0.02
    • Merchant Forward Rate:      84.58

Problem:

    • One importer wants to book a forward contract for his $ payable on Full month April, 2024.  Assuming bank is loading a margin of 2 paise per $, what rate bank would quote for him?
    • What would be the early delivery: 1/04/2024
    • Late delivery would be: 30/04/2024.
    • So, in case of importer go for late delivery that is, 30/04/2024
    • Today’s Inter-Bank Rate: Rs. 81.73
    • Add premium for 30/04:         3.17
    • Interbank forward rate:  Rs. 84.90
    • Add Margin:                              0.02
    • Merchant Forward Rate:      84.92
    • In case of fixed date delivery, the rate is efficient but customers run the risk of non-performing.
    • In case of forward contract with option delivery, the rate is inefficient, but customers do not run the risk of cancellation of contract. 

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