The Nigerian economy has at different times witnessed enormous interest rate swings in different sectors of the economy since the 1970s and mid 1980s under a regulated regime. The preferential interest rates were based on the premise that the market, if freely applied would exclude some priority sectors. Thus, interest rates were adjusted through the market forces in order to promote increased level of investment in the various preferred sectors of the economy. Prominent among the preferred sectors were the agricultural, manufacturing and solid mineral sectors which were accorded priority and deposit money banks were directed to charge preferential interest rates on all loans to encourage the upsurge of small-scale industrialization which is a catalyst for economic development (Udoka, 2000). According to Mckinnon (1973) and Shaw (1973), this situation can ignite financial repression which occurs mostly when a country imposes ceiling on deposit and lending nominal interest rate at a low level relative to inflation. The resulting low or negative interest rates discourage savings mobilization and the channelling of mobilized savings through the financial system. This has a negative effect on the quantity and quality of investment and hence economic growth.

Closely followed by the regulated interest rate regime was the interest rate reform, a policy evolved under the financial sector liberalization. The policy was put in place to achieve efficiency in the financial sector, thus, engendering financial deepening. In Nigeria, financial sector reforms started with the deregulation of interest rate in August, 1987 (Ikhide & Alawade, 2001). Since then, the Nigerian government has been pursuing a market determined interest rate which does not permit a direct state intervention in the general direction of the economy (Nyong, 2007).

Since the introduction of the interest rate liberalization concept in the 1980s, many countries such as Angola, Burundi, Congo, Ivory Coast, Ghana, Malawi, Nigeria, China, India etc.