Answer:
Their consumption function would shift upwards
Step-by-step explanation:
Their consumption function shifts upward because the lottery prize has given them an autonomous consumption of $1000. This prize is independent of income. At each level of income, consumption rises by $1000. Causing consumption spending to be shifted upward by $1000. The marginal propensity to consume is unaffected because increase in consumption is the same at each level of disposable income.