Option markets have significant variation in liquidity across different option series. Illiquidity reduces the informativeness of the price. Price information for illiquid options is more noisy, and thus the implied volatilities based on these prices are more noisy. In this paper, we propose a...

Most measures of liquidity assume that the cost of buying and selling is symmetric. This paper analyses liquidity in an open electronic limit order book exchange without market makers, where it is possible to directly measure the impact cost of a market order to buy and to sell. There is clear...