first, this week's "before the bell" with christian romans. christine?u.s. and china might be approaching an end game. trade representative last week, robert lighthizer and treasury secretary steven mnuchin traveled to beijing. the white house described those talks as productive. this week the dialogue moves to washington when china's top trade negotiator goes there. investors also remain focused on first-quarter earnings -- disney, news corp., etsy and overstock.com are among the companies reporting. lyft also delivers its first earnings report as a publicly traded company. shares are down more than 20% from their ipo price of $72. that disappointing performance has reined in expectations for uber's debut. the ride-hailing giant aims to sell its shares for $44 to $50 apiece. all in, that represents a valuation of $91 billion. uber originally targeted a valuation of $100 billion, according to the "wall street journal." look for the company to price thursday night and begin trading on friday. in new york, i'm christine romans. ♪ you should be mad they gav