demand for individual products, separate estimates of elasticity are in most cases neces-
sary for the products falling within each group. Thus while the income elasticity for most
kinds of fresh meat is put at 1.10, poultry is given the higher elasticity of 1.50, while a
much lower figure (0. 10) is assigned to salt meat; within the cereals group similarly a
lower elasticity has been assumed for rice and corn meal than for wheat flour and its pro-
ducts. In the estimation of these individual elasticities there is inevitably a greater ele-
ment of personal judgement since precise statistical evidence comparable to that used in
estimating the group elasticities is not in most cases available. However, in most cases
the nature of the probable relationship between the elasticities for different types of food
Within a given category is reasonably certain.

 The formula employed in making the projections on the basis of the elasticities thus
Established assumes the continuance during the period covered by the projection of the
semi-logarithmic relation between demand and income. On this assumption the projecting
equation is:

 y+ y X+ AX
 Y+ AY = 2.3026 T1 log10 X
 Y -10 x

 where i1 is the income elasticity of demand for each commodity, Y the base period con-
 sumption per capital and X the base period income per capital. This equation gives an es-
 timate of average demand per capital of population, from which the aggregate demand is
 derived by multiplying by the projected relative population for the data in question and by
 the aggregate supply in the base year 1958.