It has, partly. But a part of the inflation at least in France/Europe is also due to big corp choosing to increase prices because they can (since "there is inflation"). For example Unilever has distributed very high dividends (€19B, for a total turnover of €80B, that's almost a quarter of their total revenue going directly towards to their shareholders while their workers and consumers see nothing), while the numerous products the company sells (which are mostly daily usage food and sanitary products) have seen their prices skyrocket "because of the inflation".

Then France should not have allowed Unilever to merge so much, or at least guaranteed competition in France. If this works, they must have had either state support or a monopoly position.

Why? Why is this an axiom?

Example: supermarkets where I live co-ordinate their prices. There are 5 big chains and they all increased prices in tandem (and margins, so nothing to do with increased costs). They get slapped with a 100 miliion euro fine every year or two, but what do they care? It's a drop compared to the amount they profit from the cartelisation.