It had been expected that the introduction of current account convertibility and foreign trade liberalization would force a currency devaluation that would support export-led growth. However, when prices were de-controlled enterprises and retailers raised their prices to match those prevailing in the black market or towards world price levels, earning them windfall profits initially. Consumers reacted by reducing their purchases and by substituting better quality imported goods in place of domestically produced goods. Falling sales led to the collapse of many domestic enterprises, with personnel lay-offs or reduced hours of work and pay. This further reduced effective demand. As imports grew and exporters failed to respond to opportunities in world markets due to the poor quality of their products and lack of resources for investment, the trade deficit expanded, putting downward pressure on the exchange rate. Many wholesalers and retailers marked prices according to their dollar values and the falling exchange rate fed inflation. The central banks in several countries raised interest rates and tightened credit conditions, depriving state agencies and enterprises of working capital. These in turn found it impossible to pay wages on time, dampening effective demand further.