My suspicion is that economy stands for open or close bc of Covid and many allowed that question to determine their vote for the presidency.
Chewing on this, from the Exits:
Issue mattered most in vote - 35% economy, 20% racial inequality, 17% coronavirus, 11% crime and safety, 11% health care
Who do you trust more on the economy? 50% Trump, 48% Biden
For those who economy was #1 issue broke 82-17 for Trump.