I think that crime can cause (or exacerbate) poverty. As DL says, a small shopkeeper might not be able to stand the loss of revenue from shoplifters, and if she employs another member of staff who loses her job, that family could be plunged into poverty too.
I'm not advocating a return to harsh prison sentences (particularly for people stealing to eat) but I don't see theft as a victimless crime. I am in a number of local history groups online, and when Victorian photos are published of people imprisoned for theft there are always comments on the lines of 'a month in jail for stealing a pair of boots ?', but the same people get equally tearful when they see photos of barefoot children in the street. The stolen boots might have taken weeks of savings for the owner, who deserves to be protected by law. If the owner has to do without food to save for another pair, is that crime causing poverty or poverty causing crime?
The point is not about what causes what, but that poverty exists at all in a rich country like ours. IMO we need to have a root and branch overhaul of the tax system, taking into account individual income tax from all sources, plug gaps that allow people to transfer tax allowances within families, chase up companies that don't pay their share, crack down as hard on tax evasion as we do on benefit fraud, and anything else I've missed. Basically, if everyone who is able to pays in a fair amount, there would be enough for nobody to have to do without.