change in the quality of care is primarily due to the increased demand caused by the growth of private and public insurance. The paper presents an analytic model of the hospital industry in which quality affects the demand for hospital services and in which the purchase of private insurance is endogenous. Estimates of key equations of the model based on a cross-section of time series for the individual states for the years 1958 through 1973 are presented. The price adjustment process and dynamic multipliers are discussed. THE COST OF A DAY of hospital care in the United States has increased 600 per cent in the past twenty years, an annual rate of more than 9 per cent. During the

The classic example of an unshiftable tax is the general tax on pure rental income. Since Ricardo, economists have believed that the annual net rental income of unimproved land falls by the amount of the annual tax and its price by the capitalized value of this tax. This paper shows that these conclusions are false, that the tax on pure land rents is at least partly shifted, and that the price of land may be increased by the imposition of a tax. Implications are suggested for the analysis of the corporate income tax and the taxation of natural resources.

Michael J. Boskin, Martin Feldstein, Effects of the Charitable Deduction on Contributions by Low Income and Middle Income Households: Evidence From the National Survey of Philanthropy, The Review of Economics and Statistics, Vol. 59, No. 3 (Aug., 1977), pp. 351-354