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Relation between interest rates and currency for a nation
From Indian context, there are a number of factors that are influencing the economic condition and the exchange rate, interest rate etc. are reflection of the situation. I shall try and answer the question through the above Indian example. India is running a budget deficit of 4 odd % for last 6-7 years, which means that gov.in is spending more than their revenue collection, this money is not in the system, so the govt. has to print the money, either the direct 4% or the interest it has to pay on the money it borrows to cover the 4% (don't confuse this with US printing post 2008). After printing, the supply of INR is more compared to USD in the market (INR is current A/C convertible), value of INR w.r.t. USD falls (in simplistic terms). There is another impact of this printing, it increases the money supply in domestic market leading to inflation and overall price rise. To contain this price rise, Reserve Bank of India (RBI) increases the interest rates and increases Compulsory Reserve Ratio (CRR), thus trying to pull/lock-up money, so that overall money supply decreases, but there is a limit to which RBI can do this as overall growth rate keeps falling as money is more expensive to borrow to invest. The above (in simplistic term) how this is working. However, there are many factors in economy and the above should be treated as it is intended to, a simplistic view only.