If corruption was lower where I'm from, Portugal, we could easily double our GDP.
Corruption makes people miserable and not only the ones forced to pay the bribes.
It's like an unwritten and arbitrary set of rules that turns simple transactions into negotiations.
This not only saps energy and time but it is also deeply unfair as you are raised in a set of official written rules and moral guidelines that in practice are not observed are useless and can downright hurt you if you follow them naively.
I think corruption is one of the reasons why Southern European countries are so economically conservative and risk averse. It is much more difficult to have a business in these environments.