Marotta concedes the Italian transfer market has been transformed over the past 20 years.
He told DAZN: "We're in a major decline. In the early 2000s, player trading was only used to attract top players, while today capital gains are significant items in financial statements.
"The transfer market in Italy can only lead to break-even deals. With the exception of Como and Fiorentina, the rest have been quite conservative in their spending. We'll have to be far-sighted, and give more scope to the imagination, creativity, and expertise of managers than to shareholder financing."
Marotta also praised the club's financial backers, Oaktree, for investing in a new training centre.
He stated: "When we conducted an objective analysis of European stadiums, we didn't mention small training centers. These are lacking in Italy today.
"We have two facilities that were obsolete, but thanks to the foresight of Oaktree, which decided to invest €100 million at our request, we purchased new land. Facilities are an important part of developing talent.
"If you play in a potato field, you'll have a have a hard time taking your coach's advice."