However, Nigeria's continued failure to improve its ranking in measures of educational success or infrastructure quality suggest that much of this expenditure was conceived too hastily and ended up largely leading to waste and corruption. Weak institutions and poor governance have contributed substantially to Nigeria’s public debt problems, as the majority of projects financed by public borrowing during the late 1970s and 1980s failed to generate an adequate rate of return needed to improve the repayment capacity of the country.
Thus during the 1970s, public expenditure was primarily financed from oil revenues, made possible by the high oil prices in the 1970s, some domestic borrowing, and relatively modest external borrowing. At the time of the second oil shock in 1980, when oil prices jumped to almost $40/bbl, the Since the oil prices collapse in the early 1980s, Nigeria experienced rapid external debt built-up and dwindling foreign exchange reserves: public and publicly guaranteed external debt increased from $4.3 billion to $11.2 billion, while foreign exchange reserves were almost exhausted, from $10 billion to $1.23 billion, all between 1981 and 1983. Nigeria had to borrow heavily from commercial sources,