over the system of taxation, that system may reflect more closely the values of those in power. All large businesses incur administrative costs in the process of delivering revenue collected from customers to the suppliers of the goods or services being purchased. Taxation is no different, as governments are large organizations; the resource collected from the public through taxation is always greater than the amount which can be used by the government. The difference is called the compliance cost and includes (for example) the labor cost and other expenses incurred in complying with tax laws and rules. The collection of a tax in order to spend it on a specified purpose, for example collecting a tax on alcohol to pay directly for alcoholism-rehabilitation centers, is called hypothecation. Finance ministers often dislike this practice, since it reduces their freedom of action. Some economic theorists regard hypothecation as intellectually dishonest since, in reality, money is fungible. Furthermore, it often happens that taxes or excises initially levied to fund some specific government programs are then later diverted to the government general fund. In some cases, such taxes are collected in fundamentally inefficient ways, for example, through highway tolls. Since governments also resolve commercial disputes, especially in countries with common law, similar arguments are sometimes used to justify a sales tax or value added tax. Some (libertarians, for example) portray most or all forms of taxes as immoral due to their involuntary (and therefore eventually coercive or violent) nature. The most extreme anti-tax view, anarcho-capitalism, holds that all social services should be voluntarily bought by the people using them. Types The Organisation for Economic Co-operation and Development (OECD) publishes an analysis of the tax systems of member countries. As part of such analysis, OECD has developed a definition and system of classification of internal taxes, generally followed below. In addition, many countries impose taxes (tariffs) on the import of goods. Income Income tax Many jurisdictions tax the income of individuals and of business entities, including corporations. Generally, the authorities impose a tax on net profits from a business, on net gains, and on other income. Computation of income subject to tax may be determined under accounting principles used in the jurisdiction, which tax-law principles in the jurisdiction may modify or replace. The incidence of taxation varies by system, and some systems may be viewed as progressive or regressive. Rates of tax may vary or