A photocell is any of a wide range of sensors that react based on the presence of light or electromagnetic energy. They can be found in many different forms, from solar panels that use light to generate electricity, to photoresistors, which shift in resistance based on how much light is present.
Bond prices and yields are like a seesaw: when bond yields go up, prices go down, and when bond yields go down, prices go up. In other words, a move in the 10-year Treasury yield from 2.2% to 2.6% indicates negative market conditions, while a move from 2.6% to 2.2% indicates positive market performance.
The running yield is also called the flat yield or the interest yield. Bonds with a fixed lifespan pay back their nominal face/par value when they mature. If you buy a bond at less than par and hold to maturity youâll make a capital gain. If you pay more than par, youâll make a capital loss.