And the quality may fall or there will not be any special ones. Good wine of a particular vintage is just not made in such quantities to satisfy the needs of discounters or any supermarket chain. Thus it is, e.g., advisable to be very careful about buying fresh meat from a large chain instead of a good butcher. The value for money at a supermarket may, in fact, be lower.
So, I suggest that
does not always yield the results you think.
Here is another example: grapes. Grapes.
Most grapes sold by the main UK supermarket chains are grown in South Africa. Thanks to the policies of Tesco, Sainsbury et al, dozens of growers are being squeezed out of business. Some of these supermarkets don't even tell the supplier the price until the stuff is on the shelves and the selling price established.
The growers supplying Marks & Spencer and Waitrose -- smaller chains with a different philosophy and higher prices -- are doing quite well and supplying good quality.
The free market at its best?
Or bananas. The EU has been preferentially importing bananas from certain parts of the Caribbean (ex-French and British colonies), partly as a way to help them economically, but the USA has been applying pressure to permit better terms for Latin American bananas. Great, you might think. But who are the main suppliers from there? Companies like Del Monte, who are not famous for paying decent prices for bananas. Screwing the workers is ok?
Hooray for discounters?
DAS
For direct contact replace nospam with schmetterling