When you realise that Lagos alone consumes 8000 cows per day, put the cost at N100,000 per cow for easy maths = N800,000,000 daily. Now imagine the amount pan Nigeria. Move to grains - millet, sorghum, maize, soya beans. Sorghum especially for the stout and beer we consume...

If you are still in doubt, check the NBS figures for amount Nigerians spend on beef,

Move to the leather market, go check the figures these people make from leather export to China. Kano is the hub..

Do you know how much money is made on 'zobo'?

Go and read about the commodity market in Nigeria / west Africa. These men up north control the chain including supply and logistics.

If your brain can put all these together, you will discard the thought that every successful Northerner made it from oil in the Delta.

I didn't mention Tomatoes, Onions etc.