borrowing money now and paying it back using tomorrow's dollars makes investment great for people using leverage (borrowed money).
This works because inflation means that it's easier to get $1000 in the future to pay back our loan than it is to get that same $1000 today (our rate of pay would have increased in the future, making the amount of effort required to earn $1000 much less then than it is today).
Or, flip that around , the future value of $1000 is less than it is today (hence it costs us less to pay it back at some point in the future).
This implies that the higher the rate of inflation, the better it is for people with loans.
