§ 7. #Separation of state and local taxation.# For the reason just indicated the failure of the general property tax has been most conspicuous where it is used as a basis for state taxation. This has led some financial students to advocate the plan of separation of state and local taxation. This means the assignment of certain sources of revenue (such as corporations and the liquor business) primarily or exclusively to the state, leaving all real estate and the general property of non-corporate persons to be taxed by the counties and minor divisions under the general property tax. The plan has been increasingly applied in New York, until, in 1906, it became almost complete. In 1910 the plan was adopted in California; and it is largely used in New Jersey, Connecticut, Delaware, and Pennsylvania, and to a small extent in some other states. An efficient state assessment of general wealth would accomplish most of the advantages claimed for this plan, while avoiding some of its dangers. § 8. #Federal taxation of merchandise and acts in commerce.# Tariff and internal revenue duties constitute the two chief revenues of the federal government. Both of these are mainly taxes on wealth. Unlike the general property taxes they are not levied upon the main body of wealth held in possession, but almost entirely upon articles of merchandise and upon acts in course of trade. Stamps on receipts, checks, deeds, bills of sale, and licenses on the sale of liquor and tobacco are taxes on business acts which are necessary to the acquisition, use, or expenditure of wealth. Goods imported are taxed at the time of entering the country; domestic products such as cigars, spirituous or malt liquors, playing cards, and (at times) matches, pig iron, and other products, are taxed usually at the time of exit from the factory. It has already been shown that when the tariff duty prevents the importation of foreign goods and by raising the price encourages domestic manufacture of the article, there is virtually taxation of the consumer to subsidize the private manufacturer. A system of properly adjusted compensatory duties (tariffs and internal duties combined) which would prevent tariff duties from having any prohibitive effect whatever could, in a great country like ours, be made to produce any revenues desired. Such a system, combined with the federal income tax, seems destined to be the chief dependence for the national government. § 9. #Proposal of the single tax on land values.# Besides the general property tax there are found in the country as a whole a large number of special property taxes. Some of these have been introduced as substitutes for the general property tax; such is the special taxation (above referred to) of mortgages, and bonds. Other special property taxes have been introduced because they were believed to be good in themselves; such are special franchise taxes on corporations and some kinds of taxes on land.