Answer :
The firm purchased new machinery worth $50,000 for its production facility during that year would support Mark's argument.
Explanation:
Gross Investment as calculated by national income and production, is part of the gross domestic product (GDP) (Represented by Variable I), given in the formula GDP = C + I + G + NX,
where C is consumption, G is government spending, and NX is net exports, given by the difference between the exports and imports, X − M.
So savings are all that is left with total consumption, public spending and consumer spending are reduced (i.e. I = GDP − C − G − NX ).