You can't really prove or disprove whether an economic theory is a good choice or not for a country at a specific time. How are you going to measure the outcom

You can't really prove or disprove whether an economic theory is a good choice or not for a country at a specific time. How are you going to measure the outcomes and for how long will you measure them? The problem with economics is how politicised this field is and how the best theory ends up being what's best for governments and politicians. Is mainstream economics what's more convenient for the 1% or what's best for the world? We will never know what the economy would be if we weren't so Keysian. Maybe we wouldn't have a crisis every 10 years.