Define the cash-flow break-even point as the sales volume (in dollars) at which cash flow equals zero.

Question:

Define the cash-flow break-even point as the sales volume (in dollars) at which cash flow equals zero.
a. Is the cash-flow break-even level of sales higher or lower than the zero-profit (accounting) break-even point?
b. If a project operates at cash-flow break-even [see part (a)] for its entire life, is its NPV positive or negative?