# Consumption function C=4141+0.78Y was estimated by the UK during the period 1949-1975. What is the marginal propensity to consume during the period?

Marginal propensity to consume during the period was $0.78$.
The consumption function $C = 4141 + 0.78 Y$, which was estimated for the UK during the period 1949-1975, means that during the period while for an average consumer with no or zero income (i.e. $Y = 0$) annual consumption $C$ was £4141. for each additional income of £1, consumer spent £0.78.
Hence, the marginal propensity to consume during the period was $0.78$.