Consider:
You run a small manufacturing company.
You pay out for raw materials and parts, and have terms of about 15-45 days with your suppliers, allowing you to sell what you made from the materials/parts and use that money to repay your suppliers.
Now imagine one of those suppliers has some small crisis and its ability to forgo payment for 45 days goes away.
It now demands to be paid up front.
You don't have the cash to pay that, because your money is all tied up in the goods on the shop floor.
You have no choice but to go to a bank and ask for some quick credit, or you have no more raw materials.
No raw materials= no finished goods = no revenue = no profits.