Some people seem to think that modern monetary theory implies that a government can spend money without limit, but that is completely untrue.
Unlike other economic decision-making systems, modern monetary theory recognises that there is a limit to the potential within any economy, and beyond that any attempt to create more economic activity will always result in inflation.
So, not only does modern monetary theory have a built-in inflation control mechanism, it also says that any government should stop spending if the resources that wants to buy are not available within the economy that it is managing. As a result, and by recognising this constraint, MMT encourages better economic decision-making, for the benefit of everyone in society. I explain this in this video.