The disparity is across the board on a wide range of...

The disparity is across the board on a wide range of products.....

The only plausible reason i could think of for such wide pricing disparities is that the population in the USA is 311million thereby giving retailers over their a much larger target market to sell their goods to thereby increasing the sales volumes and hence the lower profit margins needed to make x amount of dollars profit.

Still that could not totally justify the huge price disparities that we see on everything from computers to luxury cars in this country!