That's the neat part, you can't. Christians' call to wisdom is not because it is easy, but because when we pursue wisdom with Christ, we are becoming more like him. Thankfully, God designed this world (as outlined in Proverbs) that those who follow the ways of the wise will end up better off. That is to say, when you act in this world the way that God designed you to act, and the world to be acted in, you should not be surprised when you end up better off than those that do not. Yes, the rain falls on the saints and the wicked alike (and everyone in between), which pokes holes in the previous statement, but praise be to God that he makes us accountable for everything this side of eternity. Ecclesiastes demonstrates the holes in being wise for an individual as well. The author did all these great things and still felt unfulfilled, until as he ultimately says, found that the point of existence is to fear God and keep his commandments - that is to say, our fulfillment is found in glorifying God. Since stewardship glorifies God, that is why Christians should study economics. Not for stewardship sake alone, but for the glorification of God.
Voters are much more willing to vote for the candidate promising economic snake oil than a candidate stating economic truths. Because of this, we can educate those that want educated, but the numbers just aren't there in a democracy for enough individuals to be educated on the economic realities. There is also hubris among some that study economics that the reason their policy failed was because the policy was designed wrong, not because they are unable to design a policy to solve the solution from the outset.