In theory, a representative democracy keeps checks and balances by the people still routinely communicating with each other as if it were a direct democracy and if the representatives are not acting in accordance with the direct findings, then it's off with their heads. But in practice that's a lot of work. The reality is that most people don't want to be involved and are happy to have some figurehead do the work for…
A representative democracy ends up representing the money, not the people
But ultimately that's just people.