The Role of Competition in Inflation

I think it's Occam's razor. The most likely outcome, the most likely cause is probably the cause. The simplest explanation is usually the correct one. I'm not trying to get into an argument. If I'm wrong, I would love to be corrected. But have you seen anything beyond people just asserting it? That it's a dominant driver of inflation? So here's my challenge, mate: Show me the clear evidence.