It's true that incompetent rulers can wreak a county economy and financial systems. Nigeria economic and system has be fragile. Corrupt and bad rulers who are making things worst for the people in the country. Making efforts of the people in Nigeria worthless and useless. The main issues is the age numbers problem of bad rulers. Where are the leaders of tomorrow, we can't take over because someone wicked old men refuse to handover. If this continues Nigeria is moving no where but backward.
The question you asked is very practical in this country, during the last administration, the president appointed a lawyers as his economic team, I want you to cross check on your own, is there any good achievement from the last regime, the answer to this is no, nigeria is a country that is been down tuned by our leaders who doesn't deem it necessary to improve the life of their citizens through people oriented programs, Nigeria is blessed blessed but because of it myopic leaders, Nigeria is facing a hard time.
If a system is corrupt we should expect any good thing from it, the problem of this country is our leaders, the policy they make most times affect us negatively and that has been the case here.