Are Parliamentary Systems Better for the Economy than Presidential Ones?

According to this study quote “presidential regimes suffer from lower economic growth, higher inflation, and greater income inequality” and quote “ On average, countries with presidential systems experience growth rates that are 0.6 to 1.2 percentage points lower than those in parliamentary systems.”

Link: https://www.internationalaffairs.org.au/australianoutlook/why-parliamentary-systems-are-better-for-the-economy-than-the-presidential-ones/