[Chris Concannon] Too many stocks are priced more than $200 a share, and that's a problem for market participation. Individual shares of stocks have much higher prices than they used to, discouraging retail investors and reducing the volume of shares changing hands, according to Chris Concannon, CEO of BATS Global Markets. Concannon said in a newsletter that Wall Street executives are partly responsible for this by refusing stock splits, in which companies increase the number of shares outstanding while also lowering the price of each individual share. In a 2-for-1 split, for example, everyone who owns one share of the stock suddenly owns two shares. That means the number of shares outstanding doubles and the share price halves. That way, the company's market value is left intact, but there are more shares up for grabs, which are more attractive to new potential shareholders. This attractiveness to smaller investors is often the reason why companies do them. But higher prices ultimately increase the bid-offer spreads and the transaction costs of trading. And that's keeping may retail investors on the sidelines, he said. Concannon explained why more companies are not splitting their stocks, and the consequences of that avoidance (emphasis ours): In an ill-conceived effort to attract “long-term investors” and detract “speculators” from trading in their stocks, a number of popular U.S. companies have kept their nominal stock prices above $200, $500, or even $1,000 per share. While intended to attract buy-and-hold investors, THESE HIGHER NOMINAL STOCK PRICES CAN ACTUALLY NEGATIVELY IMPACT LIQUIDITY, TRADING COSTS, AND INVESTOR PARTICIPATION, affecting returns and the value of equity holdings for investors both large and small. As Concannon explained, the average daily share volume of stocks fell 9% in the year through the end of April. But the dollar amount of stocks that exchanged hands — or the average notional volume — jumped 15% in that same time to $283 billion. He noted that the current average share price of an S&P 500 stock is about $84, higher than the average of $30 to $50 between 1980 and 2011. "If just half of the companies with stock prices exceeding $200 were to split, small and large investors would immediately experience a savings from the smaller spreads and higher liquidity, and there is also a chance that more middle class investors could participate in the investment opportunity some of these companies present," Concannon said. SEE ALSO: THE BIGGEST PROBLEM IN THE BOND MARKET EXPLAINED WITH THE HELP OF FRIED CHICKEN Join the conversation about this story » NOW WATCH: FORMER GREEK FINANCE MINISTER: The single largest threat to the global economy