Economic or Economical?

So I was reading this research report that was claiming that a shipyard would run out of business for economical reasons... I felt it was wrong, but couldn't be certain about there grammatical rules, so here goes:

Economic means "having to do with the economy or the study of economics."
Economical means "careful or prudent in managing finances, money- saving."
Economically is the adverb form of both words.

Put differently: The adjective economic means “dealing with finances, money matters, or wealth” and “having to do with meeting material needs”: We spent money only on economic necessities that year. Economical means “saving, thrifty, not wasteful”: This new car has a much smaller, more economical engine