As a subfield of public economics, fiscal federalism is concerned with "understanding which functions and instruments are best centralized and which are best placed in the sphere of decentralized levels of government" (Oates, 1999). In other words, it is the study of how competencies (expenditure side) and fiscal instruments (revenue side) are allocated across different (vertical) layers of the administration. An important part of its subject matter is the system of transfer payments or grants by which a central government shares its revenues with lower levels of government.
Federal governments use this power to enforce national rules and standards. There are two primary types of transfers, conditional and unconditional. A conditional transfer from a federal body to a province, or other territory, involves a certain set of conditions. If the lower level of government is to receive this type of transfer, it must agree to the spending instructions of the federal government. An example of this would be the Canada Health Transfer. An unconditional grant is usually a cash or tax point transfer, with no spending instructions. An example of this would be a federal equalization transfer.
In 2017, Governor of Rivers State of Nigeria, Ezenwo Nyesom Wike said that he believes true fiscal federalism will "strengthen the economy of his country as all sections will develop based on their comparative advantages".[1] These questions arise: (a) how are federal and non-federal countries different with respect to 'fiscal federalism' or 'fiscal decentralization', and (b) how are fiscal federalism and fiscal decentralization related (similar or different)?