GAME UPDATE 0.4 > ISSUE > CAN'T DECREASE ADVERTISING WHEN BALANCE IS NEGATIVE
Ok, so this is a funny one. Sometimes, if you upgrade too fast, the factory can't keep up with the demand, and then you need to lower advertising to lower demand, or the gain / loss ratio goes off.
BUT, if your balance went negative, then the game won't let you downgrade your advertising either!
You're stuck in a downward spiral: expenses higher than production, and no way to decrease costs.