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They should be consequentialist and emphasise epistemic humility
The system that best achieves this is something like market based classical liberalism
Money is a powerful system that provides very rich information about an economy and incentives for economic agents to coordinate.
Market systems incentivise reasonably efficient allocation of goods
Market systems are very compatible with individual human autonomy, which is morally important
Market capitalist systems provide effective scope for government regulation - taxes and subsidies can control many market externalities
Consequentialism (or, to be honest, I'll take pretty much any mainstream normative theory) provides a plausible value system for trading off welfare
Economies are very complicated, and when we try to predict the effects of top down changes we often fail, sometimes catastrophically. Thus economists should acknowledge the complexity of the systems they study and practice humility