Loan
From Supremacy Wiki
Loan application form
Superpowers may take out loans at any time in the game, and the generated cash is made immediately avaiable. The maximum borrowing limit for a Superpower is $500 million per company held, in $1,000 million blocks. Interest is charged according to the Loan Rates table.
If ANY interest is not repaid, then Buying from and Selling to the commodities market will become unavailable, however it will still be possible to trade with other Superpowers.
Loans can be repaid in phase 1, after interest has been added.