Add to the “Bankroll” rule:

Cash may be positive, negative, or zero.  If a Manager’s cash is ever below zero, they must pay interest by deducting a value equal to that Manager’s cash * -0.1 rounded up from their cash every day.  If a Manager has cash below zero, and 48 hours has passed since they last paid interest in this manner, or since their cash first became negative if they have never paid interest, they lose all Bloggers, tools, and PEDs that they have.  Managers with cash less than zero may not spend cash for any reason other than paying interest.