Final answer:
Without specific data to calculate the exact change in average daily revenues for local restaurants, we can't provide a definitive answer. However, economic principles suggest that a decrease in skiers' length of stay may lead to decreased revenue, unless other factors such as increased visitor numbers or spending per skier compensate.
Step-by-step explanation:
To determine the change in average daily revenues of local restaurants compared to last year when skiers stayed for 25 days, we need specific numerical data regarding the average daily revenues or the number of skiers and their average spending habits. Without this information, we can't accurately calculate the change in revenue. However, we can deduce from general economic principles that if the duration of stay for skiers has decreased from the previous year, this could potentially lead to a decrease in average daily revenues for local restaurants, assuming that skiers contribute significantly to restaurant revenues during their stay. If skiers were major patrons of these restaurants, fewer skier-days would likely mean less total revenue unless offset by more skiers coming or increased spending per skier. Conversely, if restaurants have other sources of revenue that have increased, or if there are more skiers staying fewer days but spending more, they could see an increase in average daily revenues.