Rachel Ziemba

Rachel Ziemba is not mentioned in any of the provided news articles. The articles discuss Walmart reaching a trillion-dollar market cap due to a new CEO and a trade deal with India, Donald Trump reducing tariffs on Indian goods in exchange for trade concessions and a halt to Russian oil purchases, and the economic uncertainty in Venezuela following the abduction of President Nicolas Maduro. Therefore, there is no information available to provide a summary about Rachel Ziemba based on the given context. The articles focus on international trade, economics, and political events involving Walmart, the US, India, and Venezuela.