Take the example of a lawyer who is a partner in a large law firm.
It's pretty easy for a lawyer to arrange their affairs, leave the partnership inactive and return to their job as a lawyer later.
I think someone who has worked most of their career in the private sector would have a portfolio of investments, stocks and so on. They might have one.
We could adopt a rule to diversify their assets, but I think that's a barrier for someone who's likely to have a very short career in politics.
If we do that, we'll gradually go back to having people with professional backgrounds in the public sector, such as lawyers or political advisers, who will have a rather short-lived career in partisan politics.