Every order carries a cost that is not on the ticket. The displayed spread is the visible part; slippage as an order walks the book, market impact from signaling intent, and the timing risk of working an order over minutes or hours are the rest. Execution quality is the discipline of measuring that full cost and choosing the method that minimizes it for a given order.
The articles in this hub explain how slippage and market impact arise in digital asset markets that run 24/7 across fragmented venues, when a single RFQ beats an algorithm, and how a desk should evaluate the execution a liquidity provider delivered. The comparisons set the main execution models side by side.