What Marcel Proust wanted from life most of all was unconditional requited love, and the way he went after it smothering the objects of his affection with gifts cost him a fortune. To pay for such extravagance, he engaged in daring speculations on the stock exchange. The task of his cousin and financial adviser, Lionel Hauser, was to make sure these speculations would not go sour. In Proust and His Banker, Gian Balsamo reveals that Proust was quite aware of the advantageous trade-off between financial indulgence and artistic inspiration; his liberal squandering of money provided...