ökonomisch
economic
Relating to the economy or national economy.
Die Regierung diskutiert neue ökonomische Reformen.
The government is discussing new economic reforms.

economic / economical
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economic
Relating to the economy or national economy.
Die Regierung diskutiert neue ökonomische Reformen.
The government is discussing new economic reforms.

The adjective 'ökonomisch' is derived from the noun 'die Ökonomie' (economy). It describes things that have to do with the economy or with economical action.
Die ökonomische Lage des Landes hat sich verbessert.
The country's economic situation has improved.
To recognize the meaning, pay attention to the context. In connection with politics or academia, 'ökonomisch' usually means 'relating to the economy'. When it is about the use of resources such as money or time, it means 'sparsam' (economical/frugal).
Die ökonomische Analyse der Regierung war sehr detailliert.
The government's economic analysis was very detailed.
The word 'ökonomisch' is often used in formal, technical, or written contexts, for example in the news, in academia, or in business reports.
Der Bericht liefert eine detaillierte ökonomische Bewertung des Projekts.
The report provides a detailed economic assessment of the project.
In the meaning of 'die Wirtschaft betreffend' (relating to the economy), 'ökonomisch' is often combined with abstract nouns. Typical examples are 'ökonomisches Wachstum' (economic growth), 'ökonomische Interessen' (economic interests), or 'ökonomische Bildung' (economic education).
Viele Länder stehen unter starkem ökonomischem Druck.
Many countries are under strong economic pressure.
In the meaning of 'sparsam' (economical/frugal), 'ökonomisch' often describes an action or decision. Common combinations are 'ökonomisch handeln' (to act economically), 'ökonomisch denken' (to think economically), or an 'ökonomische Lösung' (economical solution).
Wir müssen versuchen, mit den vorhandenen Mitteln möglichst ökonomisch zu haushalten.
We have to try to manage the available resources as economically as possible.
economic / economical
'wirtschaftlich' and 'ökonomisch' can often be used in very similar ways. Both can refer to the economy, for example to prices, trade, or companies. Both can also mean that someone uses money, time, or material sparingly and efficiently. 'wirtschaftlich' often sounds more natural in everyday language and in companies. 'ökonomisch' sounds a little more technical or formal, for example in studies, politics, or academia. Learners can easily confuse the words because in many sentences they fit almost equally well. If you want to speak simply and naturally in everyday language, 'wirtschaftlich' is usually the safe choice.

In der Studie werden die ökonomischen Folgen der Energiepreise untersucht.
The study examines the economic consequences of energy prices.
Der Betrieb arbeitet wirtschaftlich und kann die Preise stabil halten.
The business operates efficiently and can keep prices stable.