according to amazon executive brittan lad the last mile on average makes up nearly of transport costs it is not yet entirely clear how economically viable these technologies are and major issues of financial and regulatory responsibilities need solutions the last mile is usually a speed bottleneck because the final link between the major hubs and end users such as smes is disproportionately expensive and technologically complex to solve and yet the most valuable for smes in remote areas the last mile problem can equally be a first mile issue when they function as suppliers to the hubs