>If you hoard currency that is managed by a central authority, then other people can't obtain currency for their productivity, and thus can't consume market goods.

This is fixed by removing the central authority monopoly over the printing of money and/or make them actually print the money.

>until and unless the day when past hoarders rush to market at the same time

This is no different than the status quo. Bill Gates could try to 'cash in' all his 50 billions into rice. Would that be 'causing sudden inflation'?