The one that often has unintended impact that an economic actor’s actions on
the well-being of another actor who stands by

The inability of a market if it falls short of allocating resources efficiently

The ability of a single actor  (or a few actors) to control or substantially
influence market prices

The ability of a market if it falls short of allocating resources efficiently

The allocation of resources through the decentralized decisions of many
producers and households that interact in various markets