If you can show concrete, supported evidence that foods produced with kosher supervision cost more than non-kosher foods of the same or comparable type, then fine. Otherwise, there's nothing to talk about but an old myth meant to spread hatred of Jews . Is there a "Halal tax" also?

And I'm not talking about foods from Jewish/Muslim companies or kosher/halal meat and fish, but stuff made by Nestle, General Mills or Pepsico. Let's take an example, shall we? Marshmallows cannot be kosher or halal as gelatin comes from animals. Can you find me significant price differences on Lucky Charms vs. other cereals. Better yet, wine. The only kosher wine is those made by Jewish companies, like Bartenura. Is there some bizarre "Jew tax" on non-kosher wines too?