I received the following "warning" from a travel firm we use occasionally for European travel. They do/did a big volume in European car rentals:
"NOW IT BEGINS: BIG JUMP IN FRANCE RENTAL CAR RATES
The foregoing was written over the 4th of July weekend, and today we were notified that on July 9 auto rental rates in France will increase 300% to 500%. That’s right, what today is a $300 rental will soon be in the $900 to $1500 range.
This France price hike involves the very same rental companies we book in the rest of Europe—Avis, Budget, Hertz, Europcar, Sixt, Enterprise, etc. It is a clear signal that rapidly increasing customer demand is reducing the number of available vehicles, and will therefore move rates significantly higher...throughout Europe.