First Thing: New Fed chair Kevin Warsh faces early test amid bond market worries

Key speech to be delivered this week at Jackson Hole said to focus on productivity and demographics in the US. Plus, how do you vaccinate 1,000 little penguins in the wild?Good morning. The new US Federal Reserve chair, Kevin Warsh, faces a critical test this week amid anxiety in government bond markets over inflation and Donald Trump’s tax and spending plans. As the world’s most powerful central bank prepares for its annual Jackson Hole conference, analysts said bond traders would be looking for signals from Warsh over its commitment to fighting inflation.However, Warsh has signalled reluctance to use his speech