Re budget chain supermarkets in TH:
they have tried, oif course. When Carrefour was still here (sold off to BigC, just like Tesco, also in dire straits due to overspending elsewhere) they had a small chain of LeaderPrice AldiLidl imitations, In FRance this is quite a big budgetchain. And they failed miserably. As an anecdote there was even one in what later became the Infinity Nightclub on Sukhumvit close to Asoke-a notorious place as such, now also closed and whole area due for a new hi-rise. Tesco and BigC and the late Carrefour all tried with much cheaper own brands, but the Thai would not take it. So in the end they had to dump all that stuff at half price and loosing money. The same has happened in Malaysia.
Seems there is a Isany shopchain of lower priced goods, but only in that area, where there are far more people watching their bahts. In BKK probably rents are too high to be able to sell goods for cheap prices.
Also many of Tesco here in BKk have been downsized, esp. the nonfood (TV, washing mach, & all that) have gone away-there were far too many of that anyway. So there are now Mr. DIY, or gym/sport/training places or that French chain of camping/sports equipmt. in those floors. Plus that when they came up quickly, there were far fewer 7s and they had the wrong kind of stuff. For those wanting that UK-stuff they sell: go quicky and snatch up the supplies (scottish shortbread, Tesco Biscuits and Own brands).
@OJ: The UK profits from the EU for that. Those big juicy oranges from Spain(US also has them, Florida-Minute Maid) dont grow here. Plus a much smaller market, and that even carved up between many players, makes for much smaller and thus per unit much costlier drinks in the packet. Normal Thai can do with their own diluted small bottles (10% or even 25%), and thats even subsidized or lesser taxed. But the 20 bt nice&cool Orange shakes just round the corner here made to order do nicely in the current heat. For farang specify ´mai say kleua=no salt inside). Also same price for about any other local fruit, incl. the oversweet mango.