[lostmsu]

The rich can also lose on such swings.

And poor can also capitalize on the up swings.

The difference is not so much in access to markets, but in who plays them better.

There are also major omissions like the fact that mortgage rates are often fixed (poor are protected), but margin rates are generally not (rich get hurt).

[ponkpanda]

fixed rates embed best current (market) estimate of path of future floating rates.

The fixed rate payer/receiver is protected but they typically pay for that protection.