Here’s a mashal: Imagine a husband and wife with a strained relationship. What factors are causing the strain? Let’s say, in this hypothetical case, that the nature of their respective jobs aren’t the best for married people, one or the other has a medical condition that is both somewhat expensive and inconvenient (in a sense of taking proper care of it, like avoiding a type of food, etc), they live on a block with nasty neighbors, his irreligious cousin whom she hates when he comes over, her cousin whose politics he [the husband] thinks are delusional. Further putting strain on their relationship are a lack of middos by both, they’re not very sensitive to each others feelings, they each have habits that really irk the other, etc. So there are many, many different things that an all be fairly and accurately said to be straining the relationship. But it is also obvious that certain things are far more negligent, &/or more intrinsic, than others, meaning if they want to fix up their relationship, the things to blame the strain on are the more negligent and the less intrinsic ones. The economy is the same idea – there are all sorts of things that hamper commerce, but some are far more negligent, or far less intrinsic [to a market], than others.