Most psychology work is done in universities with limited funding. Hiring the staff to run a study with 20,000 people is prohibitively expensive for any lab. S

Most psychology work is done in universities with limited funding. Hiring the staff to run a study with 20,000 people is prohibitively expensive for any lab. Some alternatives exist - for example, some studies can be run on Amazon Mechanical Turk. Tom Griffiths using this to good effect. (& I did the same for my dissertation)