countries, and with expected growth in gross na- 

 tional product, future requirements for capital do 

 not appear particularly imposing.'" It has, therefore, 

 been assumed that capital availability will not signifi- 

 cantly constrain long-term economic growth in gen- 

 eral or intensified use of forest and range lands and 

 the production of renewable resources products. 



'"At current levels of gross national product, a 1 percent 

 increase in the rate of annual investment would yield about 20 

 billion dollars of additional capital. Such an increase is well within 

 the range of experience of the United States and western European 

 countries. See. for example, Edward F. Denison (In Why growth 

 rates differ. The Brookings Institution. Washington, D.C. 1967, 

 p. 117-120) and Barry Bosworth. (In Hearings on long-term 

 economic growth) Joint Economic Committee. U.S. Congress. 

 November 16, 1976, p. 109. 



Other Assumptions 



In addition to the general assumptions outUned 

 above, the projections of demands and supplies for 

 the products included in this document rest on a va- 

 riety of other specified and implied assumptions. 

 The most important are described in the appropriate 

 places in the chapters that follow. Such assumptions 

 include those on prices, changes in commercial tim- 

 berland and rangeland areas, management intensi- 

 ties, the continuation of past relationships between 

 variables, and constraints on the supplies of renew- 

 able resources associated with multiple-use manage- 

 ment. 



