I am in the end game of a gigantic, all abundant, tight clusters, suicidal game. My treasury was about 500K and my net income was 25K per turn or so. I had completed researching everything (tech victory turned off) so I replaced my research tiles with stock markets as my military was beginning to eat into my revenue stream. After replacing all research tiles, buying a lot of them, but not 500K worth, I finished the turn. The next turn the Treasury was -214........ a very large negative number. All the money I owed on leases disappeared and I was grossing 50K and netting 25K per turn, but the revenue did not make a dent in the number displayed in the treasurey.