By FOX Sports Staff
Bayern Munich defeated Juventus 2-0 on Wednesday to advance to the semi-finals of the Champions League on a 4-0 aggregate.
Marotta admits that Bayern thoroughly deserved the result, which he believes is the culmination of hard work on their infrastructure from the previous seasons.
"Over the 180 minutes they were superior, but it was not just because of this season," Marotta told Mediaset.
"Bayern have reached the Champions League Final three times recently and won the German League with six rounds to spare.
"There was definitely a gap, that was clear, but the German clubs are at a more advanced stage in the rebuilding process. We are following their example.
"The economic factor also decides the transfer strategy. Today we have clubs like Bayern who double the revenue of Italian sides like Milan, Inter or Juventus. Of course they can buy just one player for €40m, whereas Italian clubs have to band together with three or four to raise that sum."
Most Serie A clubs rent their stadiums from city councils and lose revenue on it - a situation Juve avoided after moving into their own Juventus Stadium this season.
Marotta insists that the Italian sides will need to receive help from their countrymen in order to boost their income and compete with other clubs across Europe.
"Juventus are starting on that road with a new stadium, but the other Serie A clubs still have that handicap.
"It is very simple, as Italian sides have almost 70% of their revenue from TV rights, whereas the German clubs split between TV rights, commercial rights and the stadiums. It's clear in Italy that there is a lack of stadiums that can be owned by the clubs to boost income.
"I thank our squad, as we started this new era two and a half years ago, when we never imagined we'd be in the Champions League quarter-finals against a huge superpower like Bayern.
"We are still working and do not have the quality needed as yet to be in that group of superpowers. Unfortunately, right now the Italian clubs are far behind in purely economic terms, which therefore affects the transfer potential."
Juve coach Antonio Conte echoed Marotta's views and called for a widespread improvement in Italian football.
"It makes me laugh when I hear that with just two or three new signings we can win the Champions League," he said, warning that Italian clubs can no longer match the financial power of Real Madrid, Barcelona, the two Manchester clubs, Paris St Germain and Bayern.
"Italian football has come to a standstill and that should be a concern for everyone. When was the last time an Italian team reached the semi-finals?
"I think everyone has to pull together to try and change things in Italian football. When I say everyone, I mean the clubs, the supporters, the media and all the institutions."
The only Italian team left in Europe is Lazio, who are trailing Fenerbahce 2-0 in the Europa League quarter finals.