Earlier quoted context omitted.
I always thought credit was created by merchants to screw the nobility. If there's anything that screws the poor, it's inflation .
Inflation screws people with savings, which excludes the poorest.
Do a simple math experiment: Imagine being poor and spending 90% of your income on day to day, inflation-sensitive expenses, versus being rich and spending 20% of income on these expenses. A 10% inflation for you means that now you are spending 99% of your income, resulting in a 90% loss in living margin. For the rich person there is only a 2.5% loss in living margin. (I picked 10% because that is an easy calculation, the effect is true at any inflation level).
Now the common retort is that wages will catch up with inflation. But is that true? If that were, why would periodically increase the mininum wage? In fact, not having wages catch up with inflation is part of liberal economic policy (it's good for employment![1]):
http://krugman.blogs.nytimes.com/2010/02/13/the-case-for-hig...
[1] I guess one good way of keeping employment metrics high is keeping your population enchained to a moving economic treadmill that brutally nudges them toward finding employment.