Do you happen to know why these laws apply to a few named categories (not including what he wants to sell) rather than everything, and why they apply only when

Do you happen to know why these laws apply to a few named categories (not including what he wants to sell) rather than everything, and why they apply only when the relevant states declare an emergency? I don't mean why you think they should do so, or might, but do you know the actual reasoning applied by the legislatures at the time of enactment?