They have to give the bank an idea as to what the farmer thinks the crop will be worth, at harvesting and shipping, to be able to get a loan for their supplies.
Well, if interest on the debt were to rise above 9 percent, worldwide, the debt payments would exceed the entire worldwide GDP.
Maximum notional debt would be around 1260 Trillion, and would expand at 5x the increase in global GDP, assuming 5 percent on the debt.
Wow, no wonder the government is trying to keep interest as low as it is.