Explain why a developing country with a fixed exchange rate and foreign exchange controls in place (perfectly

Question:

Explain why a developing country with a fixed and foreign exchange controls in place (perfectly immobile capital) may find itself dependent on growth in exports, foreign investment, or foreign aid to attain economic growth.
Exchange Rate
The value of one currency for the purpose of conversion to another. Exchange Rate means on any day, for purposes of determining the Dollar Equivalent of any currency other than Dollars, the rate at which such currency may be exchanged into Dollars...