Selling prescription eyeglasses online is challenging. But one company has half the market and they are poised to take advantage of coming changes in technology to expand their business dramatically. A lot of stores will close and the remaining ones will have to lower their prices.

There are words we use to help us convince other people that we think work well. A lot of those words are actually working against the selling effort. An artificial intelligence program has analyzed over 500 thousand sales calls and tells you what words are really effective.

Secondhand clothing stores used to be local, mom-and-pop businesses. Going online has allowed them to move into the territory of big off-price retailers like Ross Stores, Burlington Coat and TJ Maxx (TJX Corp.). That presents a threat to the off-pricers that could be turned into an opportunity.