Will market co-operation lead to post-pandemic collusion?

Competition in the free market is best for everyone. Except when it's not. In the time of COVID-19, it most definitely is not. Rod Sims is chairman of the Australian Competition and Consumer Commission. He says that when we are fighting a pandemic-induced war, the economy is flipped on its head. We must all work together to supply what people need, even if it involves co-operating with rival companies. But once all parties have sat at the same table, how do we prevent collusion after the 'war' is over?