Economics studies the production of wealth, which is more relevant to business? Also economics claim to have a strong predictive power? I don't know.

There are also interesting differences in how economists view themselves compared to other humanities, see this (biased) paper: Fourcade et al, the Superiority of Economists http://pubs.aeaweb.org/doi/pdfplus/10.1257/jep.29.1.89 Economics tend to be a more insular and hierarchical discipline, and views itself as non-normative.