Every banker dreams of being able to beat the market. Whoever can outguess the consensus of financial actors more than 50% of the time stands to reap huge rewards. But that trick requires better information than is available to the general marketplace and the capacity to make better use of that information.
Many financial markets are so efficient that it isn't possible to gain access to information that is not widely or even universally disseminated. Others, however, afford opportunities for the knowledgeable few to outperform the information-deprived many.