Amazon.com is one of the biggest, and therefore most influential, stocks in the US equity market, and it has surged more than 30% so far this year. Netflix is another trading favourite, up more than 20% in 2017 and nearly 60% over the past 12 months, MarketWatch reports.

So here’s a trivia question: how much have these iconic stocks, both of which embody the current internet age, directly contributed to the gain of the overall technology sector, itself the biggest gainer of the year, up more than 14%?