Assume that an average firm in the office supply business has a 6% profit margin, a 40% total liabilities/assests ratio, a total assets turnover of 2 times, and a dividend payout ratio of 40%. Is it true that if such a firm is to have any sales growth (g>0), it will be forced to borrow or to sell common stock (that is, it will need some nonspontaneous external capital even if g is very small)? Explain.