“…In comparison with limit order, market order in the traditional sense is aimed at the counterside best quote and is considered to have an advantage in certainty of execution. Limit order, on the other hand, is associated with "nonexecution risk" and "free-option risk," i.e., a quote left in the market to be hit by a counterside informed trader as discussed in Fong and Liu (2010). Prior to the introduction of algorithmic trading in the FX markets failures of market orders are relatively rare, as shown in Table 13.2 for 2003.…”