There once was an old French lady who ran a small market in her village for years.
One day, a huge corporate supermarket set up across the road from her little shop. They put up signs advertising their prices, including one that said "Butter - 10 francs".
In response, the lady added a sign to her own window, "Butter - 9 francs". The next day, the big supermarket had a new sign, "Butter - 8 francs". Sure enough, the day after the lady's sign now read "7 francs".
This went on for a while, until eventually one of the lady's customers pointed to the sign and said, "Madame, you cannot keep your prices so low for long. These big companies can use their buying power to sell products cheaper, but a little store like yours can never compete."
In response, the old lady bent forward conspiratorially and muttered,
"Monsieur, I don't even sell butter."