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For example , a larger percentage of full-time , first-year undergraduates with higher sticker prices indicated factors such as institutional reputation , financial aid , and job placement as reasons for attending compared with those with sticker prices below $ 12,000 in public research universities . Industry analysts cite unusally high supplies at refineries and the falling price of crude oil as reasons for the lowest summertime gas prices in three years . Not long after , the Rockefeller Foundation retracted its support , claiming the political instability in Austria and the meager contribution the Vienna Ministry was making to the program as reasons for their withdrawal . I can see condensation of tars and contamination of oil as reasons for frequent overhauls and oil changes but the only wear mechanism I can see ( as long as the lubricant remains in spec ) is ash getting into the engine . Among these , five states reported increased salary or performance pay as reasons for evaluation , but varied in the inclusion of other reasons for evaluation : one state includes certification and increased salary ; one state includes improvement and increased salary ; one state includes improvement , certification , and performance pay ; and two states include improvement and performance pay . The association pointed to the same factors mentioned in the UAMS report as reasons behind the shortage : an aging population , increased demand for health care and an aging physician work force .