He or she does this by using each branch the executive, legislative, and judical branches.
Inflation requires prices to rise across a "basket" of goods and services, such as the one that comprises the most common measure of price changes, the consumer price index (CPI). When the prices of goods that are non-discretionary and impossible to substitute – food and fuel – rise, they can affect inflation all by themselves. For this reason, economists often strip out food and fuel to look at "core" inflation, a less volatile measure of price changes.
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I think they make U-shaped valleys but I don't know if there is a specific name for it
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