Yes astrology can help giving business ideas. Out of the twelve houses of the horoscope, four houses, in particular, are dedicated to business. These houses give sufficient business ideas from your birth chart provided the person reading the birth chart if capable of reading it effectively. I have seen people opting for wrong businesses and later closing them down with significant losses. They swayed to some idea and started a business, but since the Bhav/houses and the planets responsible for running the business were not in sync, the business fell apart. First of all, the native should have good business yoga, and after that, it should be checked with which kind of business this yoga will fructify the most. This method of correlation gives sufficient business ideas that succeed.