You can't compare phenotype and genotype in this manner. Just like you can't play an instrument you don't have, you can't express genes that aren't in your genotype. Epigenetics will basically modify what genes are expressed. It will get you from phenotype A to phenotype B if you will, but saying it is "different from your genotype" doesn't make sense. All your possible phenotypes are contained in your genotype.

"when gas burns in air, it becomes a gas" 😂

I didn't say it was not eli5, I said it doesn't answer the question. You tried to explain why prices fluctuate, not how companies can predict the prices accurately.

I don't think that answers the question