Look after the little guy.
It's the little guys that are flexible enough to get you out of the shit! Treat them well and they'll always be there for you.
Yes they might not have the legal might of a public listed company, but these are the guys who will sit in the battle trenches with you. These are the companies which -- because they’re small and nimble -- will deliver in 24 hours. Who will come through and fix something because you’re in trouble and need help.
Look after them.
Don’t be that arsehole large company who has a deliberate strategy of delaying payment.
One day you, BIG COMPANY, will need urgent help. And that guy who used to help you in the past will, at best, ask for prepayment, or, at worst, no longer be in business. Because YOU BIG COMPANY squeezed them (for no good reason).