The bank balances of several people are as follows: $123.49, $75.23, −$123.69, $75.89, −$123.43

To find the lowest balance among the given amounts, we need to compare all of the balances:

- $123.49
- $75.23
- -$123.69
- $75.89
- -$123.43

The negative balances indicate amounts that are below zero. Among these amounts, the negative balances are -$123.69 and -$123.43.

Comparing the negative balances:
- -$123.69 is lower than -$123.43.

Thus, the lowest balance is **-$123.69** (or in dollars: **-123.69**).