<span>According to Adam Smith the government should play a "very minimal" role in the economy, since Smith believed that the economy should be dictated by the "invisible hand of the market"--meaning in today's terms a "free market" economy. </span>
Mansa Musa inherited a kingdom that was already wealthy, but his work in expanding trade made Mali the wealthiest kingdom in Africa. His riches came from mining significant salt and gold deposits in the Mali kingdom. Elephant ivory was another major source of wealth.
That depend on the countries very much and a lot of factors to consider. However without government, it may be likely that the country collapse due to being lawless. This mean a murderer or kidnapper may get away with killing someone. Thus government is efficient depending on what they do.