‘economic’ or ‘economical’?

The dictionary defines the word economic as ‘relating to economics’ <economic theories> and ‘of, relating to, or based on the production, distribution, and consumption of goods and services’ <economic growth>.

The word economical means ‘marked by careful, efficient, prudent use of resources,’ as in, an economical car.

So, ‘we are looking for a more economic way of doing business,’ but ‘this would be a practical and economical solution to the problem.’