The economy of every nation primarily lies in the hands of the government. If the government aren't doing their job then even the entrepreneurs will find it very difficult to survive.
Entrepreneurs, investors and resources are very important for any countries growth but with a bad government the best entrepreneurs, investors and human or natural resources usually go out of the country and this is why many talented and gifted nation are still behind economically.
I think I have to agree with you, and disagree partially with what the OP said, because I don't think the economy of a nation lies in the hand of investors and entrepreneurs of a nation, rather the economy of nation lies in the hands of the government. Let take my country for example, in country we have a lot businesses owned by great investors yet the economy of my country is still lagging behind. It is only when the government of my will decide to make some adjustments to the economy of my country that economy of country will look manageable to will the citizens.