Tiny Prices in a Tiny Market: Evidence from Portugal on Optimal Share Prices
利用葡萄牙股市这一天然实验场，研究最优每股价格理论。发现葡萄牙公司通过拆股追求极低股价，但低价股流动性更差、估值更低，结果不支持现有理论，增加了名义股价谜题。
Abstract The Portuguese stock market provides a natural experimental area to analyse theories of optimal price per share. Its characteristics suggest that prices should be very low. Using a sample of 20 stocks from the main Portuguese Stock Index from 1999 to 2010, we observe that Portuguese corporations indeed seek extremely low prices per share through stock splits and similar actions. However, we find that low‐price stocks are actually less liquid than high‐price stocks. Furthermore, low‐price stocks trade at lower valuation ratios. Our results do not support any of the existing theories on optimal price per share and therefore add to the nominal share price puzzle .