Concurrent powers are those that are exercised simultaneously by the national and state governments. Some examples of concurrent powers are:
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In a federal system of government, concurrent powers are powers that are held and exercised by both state and national governments. In the U.S., collecting taxes is an example of a concurrent power.
Under the Tenth Amendment, the powers that are not expressly given to the federal government are reserved to the states or the people. The enumerated powers in the constitution (and their related implied powers) are powers the federal government has. The state governments retain all of the other powers. Some powers are concurrent; the federal government has been given the power, but it hasn't been prohibited to the states, so they also can exercise it. An example would be the ability to tax.
State governments have some powers that the federal government does not have.
constitutionalism
The states were given all powers not delegated to the federal government in the Constitution. However, there are implied powers that the federal government can use.
Federal System