<span>The necessary and proper clause of the constitution is a provision in Article One of the United States Constitution that is supposed to create and enact all the laws that the government consider to be necessary and proper to bring into execution powers including Execution the foregoing Powers and many others that refer to the Constitution.</span>
Historians get their information from two different kinds of sources: primary and secondary. <span>Primary sources </span><span>are first hand sources; </span>secondary sources<span> are second-hand sources. For example, suppose there had been a car accident. The description of the accident which a witness gives to the police is a primary source because it comes from someone actually there at the time. The story in the newspaper the next day is a secondary source because the reporter who wrote the story did not actually witness it. The reporter is presenting a way of understanding the accident or an </span>interpretation<span>..</span>
Spillover costs are Productions costs paid by the general public.
Spillover costs are also known as negative externalities. These are costs or dates shouldered by third parties due to a market transaction.
