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Oil prices have been highly volatile since the end of World War II. The volatility becomes even more serious in recent time. This has implications for the economies of oil exporting countries, particularly oil dependent countries like Nigeria. The paper examined the impact of these fluctuations on macroeconomic of Nigeria.Using VAR, the impact of crude oil price changes on four key macroeconomic variables was examined. The results show that oil prices have significant impact on real GDP, money supply and unemployment. It impact on the fourth variable, consumer price index is not significant. This implies that three key macroeconomic variables in Nigeria are significantly explained by exogenous and the highly volatile variable. Hence, the economy is vulnerable to external shocks. Consequently, the macroeconomic performance will be volatile and macroeconomic management will become difficult. Diversification of the economy is necessary in order to minimize the consequences of external shocks.

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Corruption has a major impact on growth in low-income economies, while ease of doing business has a major impact on growth in developed countries. The study empirically examines the effect of corruption on ease of doing business. The study analyses unbalanced panel data of corruption rank, corruption score, control of corruption, and inflation, together with other economic and financial institutional factors and ease of doing business score for the period of 2004–2017. Results indicate that: corruption rank, inflation, and import have negative and significant effect on ease of doing business; corruption score, control of corruption, lending rate spread, and education (skill level) have positive and significant effect on ease of doing business; gross capital formation and population have insignificant negative effect on ease of doing business; export and gross domestic product have insignificant positive effect on ease of doing business. The random effect model is a consistent and most efficient model, indicating common mean value for ease of doing business for the dataset. The study recommends improved corruption scores, control of corruption, and ranks to encourage ease of doing business through monetary policy and infrastructural facilities.

Corruption has affected many countries all over the world especially the developing countries. It has various implications for both the developed and developing economies. Corruption hampers development and thus raises the level of poverty in any economy that finds itself entrenched in corrupt practices. Corruption creates uncertainty and risk in the growth and development potential of any country. The study investigated the impact of corruption on economic development in Nigeria. Secondary data were sourced from World Bank reports on Nigeria and corruption reports from transparency international on Nigeria. The data were analysed using the Ordinary Least Square (OLS) regression technique. Hypothesis tested with respect to Corruption Perception Index (CPI) was not accepted implying that the tests were statistically significant, meaning that Corruption Perception Index (CPI), a proxy for corruption in this research negatively affects economic development. On the other hand, the hypothesis tested on the Corruption Rank (CR) of Nigeria and Relative Corruption Ranking (RCR) of Nigeria among countries under review was not accepted meaning that the relative position of Nigeria among countries under review and Nigeria's rank on corruption cadre is also statistically significant. The findings show that corruption has a significant negative effect on economic growth and development. It is recommended that the Nigerian government should employ the strict application of anti-corruption codes as stipulated in the legislations that created the anticorruption agency without prejudice or double standard irrespective of the culprit's stature or position in the society. Transparency, accountability and the application of the rule of law in dealing with corrupt government officials and politicians can lead to improved CPI ranking, induce investment, and foster economic growth and development.