Ooh! 800! Eat your hat out, Leadfingers!

you cannot make reproducible experiments in fields such as Economics, Sociology, Anthropology, even to some parts of psychology and biology

'Tis true. Particularly with economics and sociology, which is why their findings are taken with a fair dose of caution by the experienced. Another lot of gobshiters are those "evolutionary psychologists" who propose a gene and an evolutionary just-so story for every nuance of behaviour.