In economic systems what takes place in one sector has impacts on another; demand for a good or service in one sector is derived from another. For instance, a consumer buying a good in a store will likely trigger the replacement of this product, which will generate ① demands for activities such as manufacturing, resource extraction and, of course, transport. What is different about transport is that it cannot exist alone and a movement cannot be ② stored An unsold product can remain on the shelf of a store until bought (often with discount incentives), but an unsold seat on a flight or unused cargo capacity in the same flight remains unsold and cannot be brought back as additional capacity ③ later In this case an opportunity has been ④ seized since the amount of transport being offered has exceeded the demand for it. The derived demand of transportation is often very difficult to reconcile with an equivalent supply, and actually transport companies would prefer to have some additional capacity to accommodate ⑤ unforeseen demand (often at much higher prices).
* reconcile: 조화시키다