Greencamo,
Actually quite a few of the tractor models sold in the USA are built by Mahindra. Using the new Tier IV model nomenclature, the 3500, 4500, 5500, and the mPower lines are all built by Mahindra. The Max/eMax, 1500, 2500 and mForce are made by others.
No doubt Mahindra calculates this in a way that works for them, it is by unit volume, sold under one brand name, etc. If you take a group like Agco it is more like saying GM instead of Chevy when comparing numbers. And you are correct it is not dollar volume, it is unit volume. JD's $$ volume would be much higher I am sure.
In the USA, if you combine Case and NH, they might be ahead of Mahindra, I'm not sure. But pick the Case or the NH and MUSA outsells them in the USA. That is significant, but we all know the gap between 2nd and 3rd place is huge. If this was a foot race, Kubota and JD cross the finish line well ahead of the pack behind them. After a space of time, here comes an entire pack of companies racing for 3rd, and Mahindra leads that pack.
The tractor market in India is huge. Mahindra is the overwhelming market share leader in India. That puts them in a good position to sell more tractors than anyone else....by unit count, and limited to a certain HP range.
So good points Greencamo, I just wanted to add a little bit. Anyway you slice it, it is impressive....but no doubt the marketing folks slice it in a way that is good for advertising. But who wouldn't?