Market is the most efficient mechanism

The interaction of the information of agents with, in principle, different plans is the very definition of what a market is. It is true that a market could incorporate not all conceivable information, but markets do incorporate all possible information. If information is not already in the market, nobody (in particular, not the government authorities) can incorporate further information.

A market reaches all possible efficiency. There is no further informational, operating, or allocative efficiency beyond the market. In that sense, if you accuse the market of being inefficient, automatically you neglect the possibility of any further possibility whatsoever of improving that inefficiency.

If you do find a possibility of improving efficiency, you automatically become part of the market, not something beyond it.

There is, for instance, no way of reflecting new information faster than through the market. To put another way, the quickest way in which new information can be reflected is precisely what a market is.