

There is enough social psychology research to suggest that most of the time people are more efficient alone than in a group, although some tasks take more than one person. Process gain vs process loss, social loafing, groupthink, etc., if you put four people on a team you might get 200%, not 400% return, or worse.
Interesting, for complex tasks that require thought, the most efficient grouping tends to involve groups with diverse backgrounds and a work culture that values disagreement… which is basically the opposite of what’s going on in American government right now, lol.
Yup. It gets even more complex depending on the tasks qualities, like if it’s a one-answer solution (e g. math) or a more open ended one (e.g. policy). Also, other disciplines argue you should also have a diverse group to better represent stakeholders, an especially important part of business and politics.