[sausage_dog]

One way to do this is that the agency places a deposit in the contract, client places deposit+payment in the contract. Then when the job is done both parties confirm and the agency receives deposit+payment and the client receives their deposit. This way both parties are incentivized to find a mutually satisfying outcome.

It's not ideal in terms of funds used, but it improves the trust situation a little bit.

[hiq]

The deposit you mention if you do this on Ethereum just corresponds to legal fees you have to pay in case of conflict in the traditional contractual approach.

This incentive already exists without Ethereum, and Ethereum doesn't improve the situation in that regard.