PONTIFICIAE ACADEMIAE SCIENTIARVM SCRIPTA VARIA - 26 
We begin by guessing values of b* and b** in (IV. 21), 
which I shall here denote by b*, and b**,. We then form a 
vector, y, say, of type nx I, where n denotes the number of 
groups of expenditure; thus 
(IV. 36) Yo = Pa € — (b* + 96°) v, 
We also form a matrix, Y» say, of order n, where 
(IV. 37) Ya = [1— (63 + 958) #1 pe 
Apart from a random element, y, and Y, are connected by 
the relationship 
(IV. 38) 
Yo = [Yq : OY] 
I c* 
; p** 
If, denoting successive time-periods by 1, 2, ..., t, we now 
define 
(IV. 39) 
VE} 15 Vas oer Vil 
111d 
(IV. 40 
VV. 
1Y,, Y,, ..., Y,! 
we can write, apart from a random element 
(IV. 41) 
Xo 
1] Stone - pag. 62