You get to decide as a customer, a buyer, and a parent what that may be. As a buyer, for instance, you decide if it is okay to pay you in one day, 60 days or 120 days. If you let people pay you in 60 days, you have made it acceptable. If you are employed, would you continue working for a company that paid you in 60 days or 90 days when your check was supposed to be ready every two weeks? We each decide what is acceptable or unacceptable. If you do not decide, you have accepted.
What does this have to do with sales, Erik? Everything! If you are de-motivated by your boss, partner, co-worker- UNACCEPTABLE! If your customers are dragging you down by not paying you on time or complaining about 2 cents on every invoice: FIRE THEM! Set your standards and you will sell better and smarter. The best part is you can focus all your positive attention helping the people who deserve it versus the ones who are unacceptable!