INDUSTRIES UNDER THE ROLLING PLAN 31 areas. The mechanism of rural development working within the existing structure cannot, however, guarantee an expansion of the base adequately. The plan, on the other hand, fails to recognize the key role of the public sector industries in priming the demand and generating supply of inputs for the ailing industries. The idea of rolling plan also inhibits the consideration of the long-term factors retarding their growth. 1 PA Samuelson, "A Catenary Turnpike Theorem Involving Consumption and the Golden Rule", American Economic Review, June 1965. 2 SM Goldman, ''Optimal Growth and Continual Planning Revision", Review of Economic Studies, April 1968. Dipankar Dasgupta, ^Catenary Turnpikes and Rolling Plans: Svnihesis and Extensions," Indian Economic Journal, April-June 1978. ( NP Federenko (ed), Economic Development and Perspective Planning, Moscow, Progress Publishers, 1975. ') OF Kurien, "The New Development Strategy: An Appraisal", Economic and Political Weekly, Special Number, August 1978. 6 Deepak Nayyar, "Industrial Development in India: Some Reflections on Growth and Stagnation", Economic and Political WeeUv, Special Number, August 1978,