na INLIS000000000023648 Ind 0010-1218005486 Linear aggregation of economic relations THEIL, H. H. Theil Amsterdam North Holland Publishing 1954 xi, 205 p. : ill. ; 25 cm. xi, 205 p. : ill. ; 25 cm. 330.1THEl Index: p. 201-205 330.1 ECONOMIC THEORIES 1007/89