How Does a Shift to Proof-of-Stake Change the Security Incentive Structure?

In Proof-of-Stake (PoS), security is maintained by validators staking their assets, rather than by miners expending computational power. The incentive structure shifts from block rewards and fees to staking rewards and transaction fees, with the added threat of 'slashing' for malicious behavior.

Security is thus tied to the value of the staked assets.