Some sacrifices have varying requirements based on what you can afford. For example, Vayikra 5:6, 5:7 and 5:11 have three different levels of sacrifices to bring for a guilt-offering depending on what you can afford.
How was it determined what one could afford? If someone couldn't afford a sheep because they were behind on their Mercedes donkey-payment, would that qualify? Or would it have to be something more along the lines of if he would have to skip a meal? Is there an objective standard?