Substitution—customers' ability to choose among comparable products—is a key factor in economic competition, as it prevents any one seller from charging inordinately high prices. If two products are sufficiently similar the customer's perspective, an increase price of will generally drive customers other, thereby reducing overall revenue for company that charges higher It is not difficult find ...

Dynamics of average length of words in Russian and English is analysed in the article. Words belonging to the diachronic text corpus Google Books Ngram and dated back to the last two centuries are studied. It was found out that average word length slightly increased in the 19th century, and then it was growing rapidly most of the 20 century and started decreasing over the period from the end of...