It was responding to:

>when you can't use contracts and the legal system to ensure trust between the parties

If a threat to sue over the violation of small amounts is not credible, the court system doesn't help.

Oh no I get that, sorry I guess I was more looking for an example where this would be really useful.

Like a certain business model that currently runs into large issues because of the costs of litigating small transactions, and would be improved through block chain.