Parkinson told reporters: "The backing [from owners Ryan Reynolds and Rob McElhenney] is key.
"There's a lot of spending power in the division. Really since day one, because we've moved so quickly as a club, we've always had to work hard to fast-track the quality level to the first team.
"We've always been playing catch up, even in the National League we were behind a lot of clubs development-wise -- the structure, academy, players coming through.
"We had to improve the standard and that filters down. The structure behind the first team has become stronger with the formation of the academy a couple of years ago.
"We've come into this division very quickly and it's important we've brought in Championship standard players to help us on this journey. Also, to help the existing players who have do so well over the last few years."