Sometimes the temperature does not decrease with height in the troposphere, but increases. Such a situation is known as a temperature inversion. Temperature inversions limit or prevent the vertical mixing of air.
Middle range machines can cost on average $400 and are often multi-function with copier and laser printer capabilities. Finally, high-end machines which offer high speeds, high capacity and high resolution come at a higher price-expect to pay $1000 - $2500 for such a fax machine.
Carfax is the most well-known provider of vehicle history reports, dating back to the late 1980s, when it actually faxed the reports to its customers. However, it is also the most expensive. A single Carfax report costs $39.99. Three will cost you $79.99, and five sell for $99.99.