Reputation is a cosmetic stat that changes depending on whether the stocks you're buying have a thumb_up -icon or a thumb_down -icon.
Trust is a stat that you gain and lose by having positive and negative net worth, respectively. It affects your maximum loan amount; higher trust = more loans.
Go to debt by buying something, make sure you're not making money, and wait for the interest to ramp up!
Pay off your loans with the money you gain by investing in stocks that are going up.¯\_(ツ)_/¯