"Pricing disparity" refers to the difference or variation in the prices of products or services within a certain market or between different sellers. It highlights the unequal pricing levels among similar items or services. Full definition
Because ETFs trade on a stock exchange, there is the potential for price disparities to develop between the trading price of the ETF shares and the trading price of the underlying securities. (us.etrade.com)
Large price disparities are particularly likely to happen if an ETF's last trade occurs well before the market close. (fidelity.com)