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I think it's transport costs, tariffs, but perhaps most of all pricing strategy from the producer or importer; positioning of a product in one place can be made "luxury" and being priced for max profit, while in the other, where there is a huge market share, the product is priced for maximum quantity.
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I wonder if there’s some quality difference between those products.
If not, I guess it’s just due to it being a relatively low unit value good, which makes it harder to arbitrage across large geographies.
Although, there are also service costs embedded in those prices and those would require PPP adjustments.