On the other hand, I would say that the four questions
While the great catalog companies of a century ago had a profound impact on how goods were marketed, they did not replace in person sales. Online sales will not either, with the possible exception of products that can be digitized such as software, music and books.
Currently, online purchases represent about 8% of all retail sales in the United States. That doesn't sound like much, until you consider the trend and the enormity of the US market. In the first 10 years of internet commercialization online sales grew from almost nothing to $117 billion dollars. By 2011 sales had reached $253 billion, and this period includes the worst recession in a generation and weak economic recovery. That's about $840 per year for each man, woman and child in the nation!
As technology improves the online experience, the growth of e-Commerce as a portion of the economy will increase. However, criminals and fraudsters already view it as a 'target rich' environment. Internet schemes and scams already abound that spread malware, steal personal information and commit fraud. The more business is done online, the more criminals will be present online.