I think the point is that the supply chains probably need upwards of years of time to adapt in some cases, you can’t just turn on a recipe that needs a full cup

I think the point is that the supply chains probably need upwards of years of time to adapt in some cases, you can’t just turn on a recipe that needs a full cup of blueberries per serving on Monday and expect there to be a spare million cups of blueberries to be lying around the supply chain on Tuesday. In the case in animal product, there are almost certainly major operations worldwide that have been built and financed purely to serve McDonalds demand. They probably have to even build these out well before entering some markets.