The reason for this is deflation. Deflation in our economy is massive and far under-reported. Deflation is especially great in areas where productivity is rising.
The way economists measure productivity is by the monetary value of the thing produced. Thus, productivity gets tied in with inflation and deflation. Suppose you make widgets, and can make 10 of them per hour. Suppose you sell each of them for $10 bucks. Now suppose inflation hits and the price of the same widgets is all of a sudden $20 per hour. You still only make 10 widgets per hour. But all of a sudden you are twice as productive according to the way the government and economists measure productivity.
The opposite happens when deflation occurs. If your widgets all of a sudden start selling for $5 per hour instead of $10, you will be considered by the official economic analysis to be twice as lazy even if you work just as hard and make just as many widgets per hour.
And there you have your problem. Deflation is hitting everything, but it is hitting industries that benefit from productivity of new technology the hardest. Take a serer cpu made today that can perform 100 times as much work as a server cpu made about 10-15 years ago. Is intel considered a hundred times more productive when they make this cpu that does 100 times more work? Of course not. Their productivity is based on how much the cpu sells for and since per cpu prices have held stable to slightly decreasing over that time, intel's productivity for that particular cpu is deemed to have decreased as well.
Or take pictures. Twenty to thirty years ago there were probably over a hundred thousand people working in photo development shops making pictures for people. Now about a 100-200 programmers (estimated) among Google, Apple, Facebook and yahoo probably provide the vast majority of picture viewing services in America. Is that a great increase of productivity? It should be, because a hundred people are doing the same stuff a hundred thousand were doing twenty years ago. But officially it isn't because picture viewing is considered to be free, so no revenue is assigned to it.
So productivity growth is happening, but unfortunately it is accompanied by large drops in pricing, which make the official measure of productivity look bad.
Why are prices dropping? This has to do with something journalists do not like to talk about -- wage stagnation, income inequality, etc.