non-potable water... cash withdrawals or watching currency fluctuations to
optimally time a money - exchange.
Not exact matches
Cheaply produced wine hasn't been
optimally fermented (that takes
time, which costs
money), yielding more sugar in that glass of red.
Optimally lenders want to lend
money to people who doesn't need loans, but in order to keep the business running they'll settle for slightly less - people who don't usually need loans, and pay the loans they do have on
time.