现在的价格比两年前提高约一半。
The cost is about half as much again as it was two years ago.
外包存在的前提相当简单：如果你能做一件事，肯定有人也能做同样的事情，价格还便宜。
Outsourcing exists on a fairly simple premise: If you can do something, there must be someone else out there capable of performing that same task — only cheaper.
原则上来说，如果这类税符合税收的一般准则，即能够在不对价格信号和企业造成大的损害的前提下增进价值，那么它们的确是有用的。
In principle such levies are useful if they meet the test for taxes: to raise revenue without harming price signals and enterprise too much.
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