It's my favorite Munger quote, and it's a really good one. So often businesses invest so much time, effort, and money into everything but incentives. No matter how much you spend on culture, perks, diversity, swag etc, if the incentives are not aligned to some over-arching goal internally, you will not get the results you're looking for.
Let me ground this in a concrete example. If your KPI is a certain number of calls per day from a sales person, here's how the most Machiavellian caller will hit it:
1. Spend little time with good prospects (they're paid by call, not by conversion!)
2. Call old numbers/disconnected/rapid disconnects
3. Call multiple numbers at once, reduce call quality etc.
For any other metric you pick (conversion rate, call time, etc) there are similar schemes that have undesirable side effects. Either you very carefully build a composite framework of incentives to use, or you take the index fund approach and compensate on overall company performance (like a stock bonus, profit bonuses, etc). Personally, I think the best option is stock bonuses, but you may disagree.
Either way, getting those incentives right is absolutely key to performance.