Yes, Amazon does more retail sales than Walmart. Their "revenue" is only 15% on all third party sales, which are now more than half of total sales on the platform. They don't report on total sales on the platform on purpose to avoid drawing attention to the fact that they are bigger than Walmart.

I think amazon may have higher total sales on its platform, but like 60% of their sales are actually sold by other marketplace sellers, not Amazon.

Walmart meanwhile does also have a marketplace, but I think still sells the overwhelming majority of their stuff direct in their physical stores.

Remember Walmart has revenue of like 600 billion a year or something crazy.

That question mark is confusing