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Lol! It is illegal to sell it lower... That is wierd
It's not if you really think about it : (take it this way)
There are 2 companies, you and me, that sales the same EXACT product. When i say EXACT its 100% the same. The difference is i am bigger than you. I bought from the main company 500 000 of this products to sale and you bought only 50 000 of this products to sale.
Now you and I are enemies... so I need to sale more... how do i do that ? We are selling the same shit... the only real way is Monopoly... how do I get it is my question ? By bringing you down... now if i sale 100 000$ worth of products (leaving me 400 left) to a price 3 times lower than you what is happening ?
I sale twice as much than you... for 3 times lower... what does that mean ? You will not have 1 sale... not 1 why would people buy from you ? its the same thing... but 3 times cheaper.... YES I am losing money... but hey im 500 000$ worth company... who you think is going to resist the longer ?
You without a sale which is a small company and can't handle loss much ?
Or me... 5x more products than you ?
Basically im pushing you out... ill kill a lot of my profits but at the end you will be out... ill be damaged... now that I am alone in the business... i can't raise the prices how ever high I want.

In France Monopoly is controlled to leave chances to smaller groups. Like in many other countries.