Where does the fiction that republicans are better for the economy come from when the economy always does better under democrats?

It seems odd that the economy always does better under democrats but in poll after poll people trust Republicans more when it comes to the economy. Is this because republicans control the media?
https://youtu.be/rRndMiVIB-w?si=mzS49Z00VUKYyX0b
This is because republicans use their influence over the media to repeat repeat repeat that they are better for the economy
This is because there is real math that shows how giving all the money to the rich will create prosperity and its just too complicated for us to understand
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FYI I will respond to misinformation if it is short but long winded misinformation I'm just going to delete.
Where does the fiction that republicans are better for the economy come from when the economy always does better under democrats?
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