Hahahahha.. Right. 🤗

He suggested..

I'm a Business administration graduate. My master is in same.

My knowledge of economics is limited.

He is a professor of economics.

My thesis subject is economic.

His proposol is also economic.

I use similar methods for them (multipliers, financial modeling etc).

I can write my thesis subject as article.

His subject can help me to write my article. And to understand economics.

He is my unofficial boss of 10 years. We write a book together. and make projects.

He is a Rector of University. He invited me to university for master

So why not.

Win- win. He will be happy. I will be happy to have 2 subjects.