Gabriel Zuckman

Because, of course, wealth taxes are something that is on the lips of lots of centre-left or left-wing politicians.

It's often said that they don't work, and to be fair, there is not a particularly glorious history of it where they've been introduced, including in France.

What is your proposal, and how would it be different?

And why do you think that would be more successful than the examples of wealth taxes, which have been introduced historically, which some have worked better than others, but generally don't have that glorious a record?

And this may be very difficult to achieve.

I mean, it's a bit like the old debate, isn't it?

The Soviet Union.

Can you have socialism in one country?

Can you do this in one country?

Because there's always going to be an incentive for some states, even European states.

I mean, Ireland is famous as a very low corporation tax rate, for example.

There's always going to be an incentive for someone to actually say, we're not going to do this.

Come here.

We're the home of the super rich.

You can spend your money here.

That's always going to be the case, isn't it?

And if they refuse to pay?

One other practical question before we wrap up.

You've already alluded to this yourself.

In terms of actually assessing the wealth of these people, it's very difficult.