this is the paragraphe that it is has token from , please help me understanding this idiom , Knowing that is from the BBC news
"
For the mass of motorists, electric cars are still much too pricey a proposition. Of nearly 250,000 cars sold in the UK last year, fewer than 11,000 were electric or hybrid vehicles. "
Have you tried googling? It always helps to google, but of course, sometimes, you can find incorrect information this way.
Moving on, a proposition is usually a business offer or plan. If it’s pricey, it means it’s expensive. If it’s “much too pricey” then it means that it’s extremely expensive.
Hope this helps!