A Harberger tax is an economic policy that seeks to strike a balance between pure private ownership of a good, and open public access to the good to increase the general welfare of the society. Ensuring that goods are more productively used by a society or group, and reducing the economic toll that monopolies have on the productivity of a society.

According to the polygon documentation, "State Sync is the native mechanism to read Ethereum data from the MATIC EVM chain" (also known as polygon).