GDP, Recession & Depression Thresholds

Overview

“The Federal Reserve’s dual mandate requires it to focus on encouraging economic growth and managing inflation levels.”

So how does the Fed know when the economy needs help? Economists watch a wide range of indicators, data sets, and market signals. This chapter covers:

• GDP/GNP
• Consumer price index (CPI)
• Yield curves
• Leading indicators
• Coincident indicators
• Lagging indicators
• Economic market structures

⚠️ MONETARY vs FISCAL POLICY — who controls what

GDP / GNP

Economic growth is commonly measured by gross domestic product (GDP) or gross national product (GNP).

What rising and falling GDP signal

🔑 RECESSION AND DEPRESSION THRESHOLDS — memorize exactly

Sidenote: Price elasticity

“GDP tells us whether overall production and spending are rising or falling, but it doesn’t tell us which goods and services are affected most. That’s where price elasticity comes in.”

Think about the word elastic — like a rubber band. It stretches when pulled and then returns to its original shape.

Merriam-Webster’s definition quoted by the text:

Elastic (adjective) Capable of being easily stretched or expanded and resuming former shape

Elastic vs inelastic

The Fed’s response to declining GDP (loosening)

“When GDP declines, the Fed typically pursues loosening (expanding) policies to increase the money supply. As interest rates fall, borrowing becomes cheaper, which can lead consumers to buy more homes, cars, and other goods.”

🔑 If the economy is shrinking, the Fed may take one or more of these actions:

Sidenote: Economic cycles

“The U.S. economy tends to move through cycles over time.”

🔑 BUSINESS CYCLE PHASES — in order

“To summarize, economies typically follow these cycles over time in this order”

Conditions at the peak vs the trough

Phase detail

Expansion

• When GDP rises, the economy is in an expansionary (or expanding) phase.
• “Low interest rates and tax-friendly laws can support expansion.”
• “When money is easier to obtain - either through borrowing or through employment - households and businesses tend to spend more, which helps the economy grow.”

Peak

• Eventually, the economy reaches a peak, although it’s hard to identify a peak in real time.
• “Even if there’s short-term turbulence, the economy can still recover before sliding into recession. The Federal Reserve can influence how these transitions play out.”

Recession / receding

• Over time, the economy typically begins to recede (shrink).
• Sometimes this happens because of a “bubble” in a particular sector. Example: “the U.S. housing bubble contributed significantly to the Great Recession of 2008.”
• In other cases, the Fed may contribute to a slowdown through tightening measures, usually in response to rising inflation (example given: the 2021-2023 inflation surge).
• Chain of effects: “When interest rates rise, less money is borrowed, which tends to reduce consumer spending. Lower spending can pressure company revenues and prices, which can lead to layoffs and rising unemployment - further weakening the economy.”
• “Over time, higher interest rates and reduced economic activity can stabilize prices and bring inflation down.”

Trough

• “At some point, the economy reaches a trough - its lowest point.”
• “After prices stabilize, the Fed often encourages growth by loosening the money supply. By injecting more money into the system, borrowing becomes more affordable, which can increase purchases of goods and services.”

Recovery

• “The economy begins to recover when GDP starts rising again, signaling a return to expansion.”
• “Job openings tend to increase, consumer confidence improves, and spending accelerates.”
• ⚠️ “Recovery and expansion look similar, but recovery specifically refers to the period after a recession.”

Consumer price index (CPI)

Goods and services tracked: “goods and services commonly purchased by households, including gasoline, groceries, cell phone contracts, and real estate.”

The Fed’s response to rising inflation (tightening)

🔑 When inflation is rising, the Fed may use one or more tightening (contracting) policies:

“These actions reduce the money supply, which tends to push interest rates higher. Money behaves like other goods: when there’s less of it available, it becomes more expensive to borrow. Higher interest rates usually reduce borrowing and spending, which can help stabilize prices over time.”

Sidenote: Personal Consumption Expenditure (PCE) Price Index

“Technically, the Federal Reserve targets inflation using the Personal Consumption Expenditure (PCE) Price Index. It’s similar to CPI, but it uses different weighting and measurement methods.”

The text links to an outside article for detail: “PCE vs. CPI: What’s the difference and why it matters right now.”

Yield curves

“Federal Reserve actions strongly influence the bond market. One way to track changing conditions is with yield curves, which show the yields of similar debt securities across different maturities.”

🔑 The three yield curve shapes

How the curve flattens (and then inverts)

One way this can happen is if investors sell short-term securities and buy long-term bonds:

“Together, these moves can flatten the curve.”

Why investors do this:

• “The Fed typically tries to lower interest rates during a recession.”
• “If investors expect rates to fall, they may buy long-term bonds to lock in higher coupons before rates decline.”
• “Also, when interest rates fall, bond prices rise, which creates potential for capital appreciation.”

Comparative yield curves (credit yield spreads)

“Investors can find yield curves for the overall bond market or for specific sectors (corporate, municipal, U.S. government, etc.). There are also comparative yield curves, sometimes called credit yield spreads, which compare two yield curves - often U.S. government versus corporate.”

Key points

Gross domestic product (GDP)

• Measure of goods and services produced and sold domestically
• Reported in constant (inflation-adjusted) dollars
• Tracks economic growth

Recession

• Two quarters (six months) of GDP decline

Depression

• Six quarters (a year and a half) of GDP decline

Elastic good or service

• Demand falls drastically as price rises
• Is not a necessity or has competition

Inelastic good or service

• Demand is generally not affected as price rises
• Is a necessity with little or no competition

Inflation

• Measured by CPI
• Fed tightens the money supply if levels rise

Yield curve

• Visual representation of bond yields
• Typically covers similar quality bonds of varying maturities

Normal (ascending) yield curve

• Short-term securities have lower yields than long-term securities
• Typical for normal economic conditions (expansion)

Flat yield curve

• Short-term securities have the same yields as long-term securities
• Sign of uncertainty in the economy

Inverted (descending) yield curve

• Short-term securities have higher yields than long-term securities
• Sign of economic recession

Comparative yield curves

• Compares yield curves of US Government vs. corporate securities
• Widening is a sign of recession
• Narrowing is a sign of prosperity

Sources

Primary/official references for the material in this chapter. Every link was fetched and returned HTTP 200 on 2026-08-15.