From Café Europa Revisited: How to Survive Post-Communism, by Slavenka Drakulic (Penguin, 2021), Kindle pp. 14-15:
In 2017, Slovakia’s consumer association tested a selection of food from supermarkets in eight EU member states: Germany, Austria, the Czech Republic, Poland, Slovakia, Hungary, Romania and Bulgaria. In some products they found small differences—in any case, the products were not identical—but there were much bigger differences in others. They tasted different and the content was different as well, from Knorr soup to Iglo fish sticks (the latter had 58 percent fish instead of 65 percent). Slovakia’s Ministry of Agriculture drew similar conclusions when comparing twenty-two same-brand products bought in Bratislava and in two Austrian towns across the border. Half of them tasted and looked different and had different compositions. For instance, a German orange drink purchased in Bratislava contained no actual juice, unlike the same product sold in Austria, which had some amount of juice.
When other countries followed suit, they found roughly the same differences. Hungary’s food safety authority examined twenty-four products sold in both Hungary and Austria. It found, among other things, that the domestic version of Manner wafers was less crunchy (and crunchiness is just about the most important “ingredient” they offer!), and the local Nutella not as creamy as the Austrian one….
In Poland, Leibniz biscuits contain 5 percent butter and some palm oil, while those sold in the company’s home market of Germany contain 12 percent butter and no palm oil, a cheap alternative to butter. The Slovene consumer association examined thirty-two products sold in Slovenia and Austria and identified ten where there was a difference in quality. The point is that the inferior version of the product was always placed in an Eastern European country and never in a Western country.
Drakulic doesn’t mention the different currencies still used in most of the Eastern European countries, nor the relative price differences between countries inside and outside the Eurozone.