Most of the revenue the government collects comes from contributions from individual taxpayers, small businesses, and corporations through taxes that get collected on a yearly or quarterly basis.
The remaining sources of federal revenue consist of excise, estate, and other taxes and fees.
A bull is an investor who expects prices to rise and, on this assumption, purchases a security or commodity in hopes of reselling it later for a profit.
A bullish market is one in which prices are generally expected to rise.