Starboard takes $1B stake in Pfizer

Starboard Value is making waves with a $1 billion investment in Pfizer, aiming for significant corporate changes. Meanwhile, Rio Tinto could be gearing up to take over Arcadium Lithium, highlighting the growing importance of lithium in the market. In the entertainment realm, the much-anticipated 'Joker' sequel is topping box office charts despite disappointing reviews. Economic trends and stock movements are also explored, providing a comprehensive snapshot of the current financial landscape.