The following appeared as a letter to the editor from a Central Plaza store owner.
"Over the past two years， the number of shoppers in Central Plaza has been steadily decreasing while the popularity of skateboarding has increased dramatically. Many Central Plaza store owners believe that the decrease in their business is due to the number of skateboard users in the plaza. There has also been a dramatic increase in the amount of litter and vandalism throughout the plaza. Thus， we recommend that the city prohibit skateboarding in Central Plaza. If skateboarding is prohibited here， we predict that business in Central Plaza will return to its previously high levels."
Write a response in which you discuss what questions would need to be answered in order to decide whether the recommendation is likely to have the predicted result. Be sure to explain how the answers to these questions would help to evaluate the recommendation.
中文翻译：
过去两年中，中心广场的顾客数量稳步下降与此同时滑板却急剧增加。很多中心广场的店主认为顾客数量下滑是由于玩滑板人数的增加。同时整个广场废弃物和公物损毁也大大增加。因此，我们建议应该在中心广场禁止玩滑板。如果禁止的话，我们估计中心广场的生意将会恢复到以前的水平。
写一篇回应，在其中讨论还有哪些问题需要被回答才能决定文中的推荐是否能得到预期结果，并务请解释对这些问题的回答是如何帮助更好的评估文中的建议的。
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