Which country is credited with pioneering the 'psychological pricing' strategy (prices ending in .99) that became a global retail standard?

Geographical location has always influenced retail pricing strategies across the globe. Different regions have pioneered various approaches that revolutionized how products are priced based on local economic factors, cultural considerations, and market dynamics. This trivia tests your knowledge about where certain influential pricing strategies first gained widespread adoption before spreading internationally.

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United States - through F.W. Woolworth's five-and-dime stores in the 1880s
United Kingdom - through Marks & Spencer's penny bazaars in the early 1900s
Germany - through Aldi's discount pricing model in the 1950s
Japan - through their post-WWII retail reconstruction efforts in the 1960s