IPA: /ˌdɪsɪˈkɒnəmi/
KK: /dɪˈziːkəˌnəmi/
A situation where costs increase instead of decrease, often due to inefficiencies or poor management.
The company faced a diseconomy when its production costs rose unexpectedly.
Diseconomy → It is formed from "dis-" (meaning apart or away) and "economy" (from Greek "oikonomia", meaning household management or administration). The term refers to a situation where economic efficiency is lost or where resources are not managed effectively, hence the idea of being apart from proper economic management.
Think of 'dis-' meaning apart and 'economy' relating to management of resources — this helps you remember that 'diseconomy' refers to poor management of economic resources.