Mr. Seamus Coffey:

It is not their fault that people invest in their business. There is equity going into the business they created that values it at €100 billion. They do not have €100 billion. They established a business that people value at €100 billion. That company might not even be making a profit. The reason it is valued at €100 billion is because there is an expectation that it will be successful. That is absolutely a significant gap, but I am not sure it is something that could be addressed with a wealth tax. The Collisons do not even live in Ireland. If we imposed a 5% wealth tax on them, would they move back?

Oxfam makes valid points and there is considerable poverty and inequality in the world, but if the analysis on wealth was presented as a student assessment, I am not sure it would score highly.