This is the 6419th most frequent German word.
economica
The word "economica" is not a German word.
Here, 'wirtschaftlich' is an adjective derived from 'Wirtschaft', meaning economy, denoting 'pertaining to economy'. It describes the quality of the country's financial system.
Die wirtschaftliche Lage des Landes ist stabil.
The economic situation of the country is stable.
In this sentence, 'Wirtschaft' denotes the field of economics or activities concerned with the production, distribution, and consumption of goods and services.
In der Schule lernen die Kinder über die Grundlagen der Wirtschaft.
At school, children learn about the basics of economics.
Here, 'wirtschaften' is a verb related to 'Wirtschaft', implying managing or economizing resources or activities.