I completely agree with you. And I like the depth you have gone into. The same variety of cotton grown in Portugal, Poland, Italy and Turkey will be different. Moreover, the same variety of cotton grown in the same place, but at different times will be different. Because the year can be hot and dry, or cold and rainy. All this will affect the cotton. And it will be different.

I have been thinking about this problem of heterogeneity. And I am grateful that you showed this complexity. I have a solution.

The name of this solution is -- arithmetic mean or in terms of material -- a mixture. I don't bet on one variety of cotton. Because it is different and we have already seen and discussed this. I make a mix of different varieties of cotton that meet the required parameters. And then I get a stable average, independent of the year or geography.