This is a good idea that should have come long ago. I think those who are dismissing it are motivated by ignorance or hatred of the person who has mooted it. Ethiopia is already far ahead in establishing a grains exchange,yet their agricultural industry is less sophisticated than Kenya’s.
There are three huge benefits as I see it (there could be more):
1. A maize futures exchange will enable farmers to be 'paid' when they need the money,not when NCPB or Wakulima market is ready to buy. This removes one of the biggest barriers that farmers face - uncertainty.
2. By enabling many more people to invest in farming - without having to farm - such an exchange will increase the capital available to agriculture in a big way which will increase our food self sufficiency
3. Such a market could encourage land consolidation,which will reduce the inefficiencies of our current small-holder model.
Of course there are risks too. The market could become subject to speculation and all sorts of underhand doings as in the NSE. But we have experience from elsewhere to learn from.
"The opposite of a correct statement is a false statement. But the opposite of a profound truth may well be another profound truth." (Niels Bohr)