Tech is taking over our lives, and our 401(k) accounts

As technology takes over more of people's daily lives, it's also taking over ever-bigger chunks of their retirement accounts.

Surging prices for technology stocks around the world mean the industry is making up a larger proportion of global markets. In the United States, Apple, Google's parent company and other tech companies account for nearly 24 percent of the Standard & Poor's 500 index. A decade ago, they made up less than 17 percent of S&P 500 index funds. The makeover is even more dramatic overseas, where ascendant companies like China's Tencent and Alibaba have quickly stormed into the ranks of the world's largest.

As a result, investing in many stock funds has increasingly become a bet on technology companies.