Who decided that the number of hipsters in a concentrated area correlate with successful tech companies?

These 'cool', 'creative' pockets within cities such as San Francisco, London and Berlin that the article suggest as a vital ingredient for developing the perfect startup environment are merely the result of artists after cheap spaces to work, exhibit and live.

After time, cool-hunters follow, prices go up, locals are pushed out, companies move in.

London, particularly the East, is full of areas such as this.