The e-commerce controversy

The government taxes everything sold.  The problem is that on the internet, the government has no power to find what has been sold, and they have no way of taxing it.  As the internet becomes a bigger way of purchasing things, the government is losing more and more money to it.  They want to tax these things but they can't.  They also have no authority of tariffs if people are selling things from one country to another.  These pose two problems in the same realm of commerce.  The government is caught on how to approach this since they don't have any real power to control it.  There are tons of examples to prove that people are making large profits and that the government is missing out.