This is source I found from another site, main source you can find in last paragraph
5) Sentiment – The majority of people still hate this market. Even the bulls are scared. You can see it every time we have a short-term selloff. Sentiment indicators spike to extreme bearish levels and many people RUSH for the exits. They do this by either selling positions, buying puts, shorting stocks, buying those toxic VIX products, or raising cash. For example, the Thursday before Hurricane Irma hit Florida, the CBOE Index Put/Call ratio hit its highest level in 7 years! The media made it out like Florida would fall into the ocean and the end of the world was near. If you don’t believe me about the current skepticism, go ask 10 random people what they think of the stock market and you’ll see exactly what I’m talking about. I understand that no one wants 2008-09 to happen to them again, but this constant fear is a generational mentality that will take a long time to change and could be another reason why the market continues higher over the longer term.
6) Pro-business Government – The mainstream media constantly undermines President Trump and tells the public that he won’t get anything accomplished for the next four years. Any progress made by the government is not priced into the market and could be a significant catalyst over the next few years. This includes progress in corporate tax reform, personal tax reform, health care reform, tax cuts, repatriation of foreign money, and infrastructure plans. For example, a reduction in the corporate tax rate can add $10-$15 in earnings to the S&P 500 and easily spark a 10% move higher. You might be thinking “What if nothing gets done?” The stock market can still perform well because of the amazing inventions that continue to revolutionize our lives (which I discuss in the next section). Right now, the concept of less regulation and a more business friendly government is fueling strong optimism among many business leaders.
7) Technology Revolution – For the past 100 years, the market’s pattern has been approximately 15-20 years of an economic boom followed by 10-15 years of a downturn or consolidation. This current cycle looks to have started with the new highs created in 2013 and could last for many years.
These cyclical uptrends are usually led by new inventions that revolutionize our lives, enhance productivity, and completely change the way we do things. In our current market, this includes smart phones, autonomous cars, machine learning, artificial intelligence, and the “Internet of things.” Experts estimate that we will see over 50 billion connected devices by 2020. These tremendous changes in technology are helping companies to drive growth and increase profit margins.