What is concentration risk in portfolio - mostly presumed to be holding one stock : NO it's wrong

Whenever it comes to concentration risk, people often go for diversification.

Right ?

But what if I tell you diversification is half of the measures, actually the concentration risk is still there.

How ?

Let me explain,

**Diversification is not holding many stocks but holding different risk exposure stock in our portfolio. It means if you hold 10 stock of the same risk exposure then it is having concentration risk**.

Example : A red Queen holds 10 stock of FMCG only and presumed to be diversified. But when commodity prices rise and economic uncertainty rises FMCG companies get hurdles to stay at what price and quantity they were selling before, it affects the margin and business.

My reason to post this : I often find posts like huge losses and mostly they are because of concentration. And I am a Researcher, so I would never make such a silly mistake. Hope it is useful to you, as I am new on reddit so I am in wonder what to post here. You can suggest

Thankyou -