Before there were photographs, sailors would return from long trips and describe animals to artists who would then create “official” images. These images helped people feel like they understood what was “out there”. But, in reality, provided almost no useful information. Check out the drawing of the rhinoceros.
You get reports from the Big 4 and compensation consultants. They have pretty charts and easily digestible info-bites. You get market data from survey providers and professional organizations. They include tons of little boxes of information on enormous spreadsheets. There is enough granularity to make you feel like you have everything and can build anything new with grains of sand that are at your fingertips. You have articles from established and new media. They provide insight and new perspective that allow you stay ahead of the trends. You follow twitter and read blogs.
But how much of what you know is factual? You may be surprised.