Not disagreeing, but the article/study seemed only to be interested in phishing, as a subtype of scamming. Only reason I bothered to mention it.
There are different tactics involved in the Nigerian prince example than in most phishing attempts.
The Nigerian prince scam assumes you are a complete idiot, while most phishing attacks disguise themselves as legitimate stuff and often try to instill a sense of urgency, hoping that you act without having time to stop and think things over.
Package related scams are for instance more common around seasons where people order lots of packages, increasing chances of hitting someone who’s waiting for a package.