When we use low-dropout switching power switching converter to reduce positive input voltage, we usually need an extra low - power negative output voltage.

在采用降压开关功率开关转换器降低正输入电压的同时，通常还需要一个额外的低功率负输出电压。

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As was demonstrated in the 1970s, even small increases in marginal tax rates have a substantial negative impact on output.

FORBES: Rising Rates Reveal Debt Reality

The Great Depression also began with a financial crisis but saw high growth rates following contractionary years, and the output lost in negative years was eventually regained through higher subsequent growth.

WSJ: Edward Lazear: The Worst Economic Recovery in History