[jacquesm]

Before figuring out what rates are fair you should take all the variables into account, the big one is probably the default rate. If enough of these small businesses go out of business the survivors will have a more difficult situation as well because their loans will have to make up the shortfall. A typical default rate for these kind of loans is 5 to 10%, that's a lot of principal losses.

[ancientworldnow]

Of course the default rate is artificially higher because only loans with high interest are available and a more widely available reasonable rates would likely lower those defaults.

[sukilot]

That is utter speculation.

[AlexandrB]

Seems kind of obvious. If expenses were lessened some of these businesses might be viable at a lower rate of profit. The only question is: how many?