Unprecedented demand for shares.That is one main piece to the puzzle that’s the present relationship between the U.S. stock market and the underlying economic system, O’Shares ETFs Chairman and “Shark Tank” investor Kevin O’Leary advised CNBC’s “ETF Edge” this week.”Institutional demand for equities is unprecedented given there’s only a few decisions,” O’Leary stated in a Monday interview. “Your fixed-income possibility of presidency bonds within the U.S. was one thing you’d … think about. That is now not an possibility.”With U.S. rates of interest close to historic lows, buyers have been pressured to hunt earnings elsewhere, O’Leary stated, including that consequently, giant, comparatively steady firms with dividend yields of two.5-3.5% have gotten more and more good bets.”That is a really engaging place to park cash for the subsequent 24 months, and also you’re seeing an incredible demand for it throughout the board,” he stated. “It is not the retail investor that is driving this market. It is institutional. I converse to them day-after-day. And so they’re saying, ‘What different selection do I’ve if my bogey over the subsequent 12 months is 6%?’ There isn’t a different selection.””Bogey” is monetary jargon for the efficiency of a given benchmark, similar to an fairness index.O’Leary added that he would not be shocked to see a coronavirus therapy or vaccine in as little as 18-24 months given current advances in medical science.Matthew Bartolini, head of SPDR Americas Analysis at State Road World Advisors, stated the current market motion means that buyers have gotten “extra selective.””Sturdy flows alongside declining quick curiosity level to bullish optimism.”Matthew BartoliniHead of SPDR Americas Analysis, State Road World Advisors”You noticed $15 billion of inflows into sector ETFs in April, with mainly well being care and tech, so XLV [and] XLK, … having probably the most flows on file in a given month as a result of buyers have been indiscriminately choosing out areas of the market that will carry out greatest throughout a interval of sluggish earnings progress [and] financial progress the place these corporations’ services are more likely to be wanted,” Bartolini stated in the identical “ETF Edge” interview.The XLV and XLK are SPDR’s S&P 500 sector ETFs monitoring well being care and know-how shares, respectively. The XLV is down about 2% yr so far and the XLK is up simply over 1%. The S&P has declined nearly 12% in that point.Latest inflows into beleaguered funds such because the U.S. World Jets ETF (JETS) and the Vitality Choose Sector SPDR Fund (XLE) may additionally sign a spike in investor urge for food for equities, Bartolini stated.”In February and March, we noticed sturdy inflows in power sector ETFs, however these flows have been for buyers desirous to go quick. Brief curiosity on XLE climbed to round 20% of its property,” Bartolini stated. “However here is the place the bottom-calling is available in: quick curiosity has declined since then and it’s now simply round 11%.”He noticed the same sample occurring within the airline ETF and different commodity-based funds.”These sturdy flows alongside declining quick curiosity level to bullish optimism on a few of the extra beaten-up areas like power,” Bartolini stated. “You are taking these traits together with inflows within the sectors with sturdy earnings like well being care and tech, and, to me, it exhibits that buyers are choosing their spots and shopping for the rally.”Disclosure: CNBC owns the unique off-network cable rights to “Shark Tank.”