Calculate demand quantities for a single set of inputs

This is a helper function for the mapply calls in food.dmnd

calc1q(Ps, Pn, Y, eps, Ysterm, Ynterm, Acoef, psscl, pnscl)

Arguments

Ps	Price of staple foods
Pn	Price of nonstaple foods
Y	Per-capita income
eps	Matrix of Marshall elasticities
Ysterm	Income term in the demand equation for staples
Ynterm	Income term in the demand equation for nonstaples
Acoef	Leading multiplier parameter.
psscl	Price scaling parameter for Staple food products
pnscl	Price scaling parameter for non-staple food products

Value

Quantities of staples and non-staples (Qs and Qn)