DoorDash and American Express led declines in software and payment stocks on Monday, following a report by Citrini Research outlining hypothetical scenarios regarding artificial intelligence's potential impact on markets and the global economy.

The report stated: "The sole purpose of this article is to model a relatively under-researched scenario."

Among the software-related companies mentioned in the report, those experiencing share price declines on Monday included: DoorDash falling 6.3%, Uber down 3.8%, Salesforce dropping 5.3%, and ServiceNow declining 4.3%.

Other mentioned stocks that declined included: MasterCard down 3.65%, Visa falling 3.0%, American Express dropping 7.5%, Capital One Financial declining 6.4%, Apollo Global Management down 5.0%, Blackstone Group falling 7.4%, and KKR declining 7.5%.