You need to follow laws to funnel money through your shell companies. In turn, global agreement could require a tax small tax for any capital gains transfers ma

You need to follow laws to funnel money through your shell companies. In turn, global agreement could require a tax small tax for any capital gains transfers made by each of those shell companies. The end result is that companies can still dodge taxes, but the more law-abiding ones aren't quite as efficient at doing so. That said, I haven't investigated the details of how this might work, and I'm sure like anything humans invent, there will be exceptions. Perhaps it would apply to large companies only, and suddenly lots of companies break up to become smaller affiliated investors that just happen to invest in the same companies in various jurisdictions, perhaps through an unaffiliated managed ETF. If there's benefit -- read: profit -- to working around a law, I'm sure folks will find a way, unfortunately.