You can optimize the rules of an economy to favor honesty though.

But that would require intelligent and cooperative people who write the laws... good luck with that. That's where pretty much any "better society/economy/politics" plan fails.

How would one possibly set it up? Dictators go mad, democracies turn politics into show-business, and I can't think of any other method that would qualify. Once you're done with a superior plan on paper, there's nothing useful you can do with it. Decorate a wall maybe.

Supporting honesty is as easy as punishing deceit. If people punish the dishonest -- and those who assist in dishonesty or refrain from punishing it -- there's little choice except being honest or getting punished. IMO, punishing the breaking of contracts is sufficient, given reasonable arbitrators on the contracts' meanings.