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    Stocks and Tweets

    Oct 25 • Behavioral Economics, Financial Markets • 429 Views

    An Indiana University researcher thinks he has confirmed that mood and stock market movement correlate. The results, though, were not what he expected.

    1) Originally, he and his students thought that they would discover a positive relationship between the direction of the Dow and Twitter sentiment. However, the connection was not sad tweets on down days and happy ones after the Dow went up. It was “calm vs. anxious.”

    2) The big surprise was that their original prediction was backwards. Looking at millions of tweets for emotional indicators, they discovered that the tweets came first. A slew of calm tweets meant the Dow would probably rise. Anxious tweets and it fell. Their accuracy? An 86.7% success rate.

    Can Twitter be used to predict the Dow?

    The Economic Lesson

    The Dow Industrial Average is an index number. Computed through a formula that uses the stock prices of 30 large companies, it provides an indication of the direction of financial markets for a specific time.

    Stock price movement is one component of the Index of Leading Indicators that is compiled by the Conference Board. As a “leading indicator” it helps predict where economic activity is heading.

    Is Twitter sentiment a leading indicator of a leading indicator? You might find an answer in A Random Walk Down Wall Street by Princeton professor Burton Malkiel.

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    Healthy Incentives

    Oct 24 • Behavioral Economics, Businesses, Macroeconomic Measurement, Regulation, Thinking Economically • 454 Views

    What happens in a school cafeteria when apples are placed in bowls rather than on a metallic pan? Sales more than double. Require trays? Students eat 21% more salads. Call corn “creamy” and more people ask for it. As displayed by the NY Times op-ed, “Lunchline Redesign”, school lunch decisions change when the incentives change.

    This takes me to a recent Brookings Institution paper on obesity. With two-thirds of all adults in the U.S. overweight and one-third obese, the impact is considerable. All of us would assume that medical costs are affected by obesity-related diseases. Also though, the paper explains that productivity, transportation, and human capital suffer. Whether looking at extra sick days, extra fuel costs, or less education, the cost of obesity affects our economy.

    Which incentives might make school cafeteria managers implement changes that encourage healthy eating decisions?

    The Economic Lesson

    An externality is the impact of a behavior or contract that is experienced by a third uninvolved party. When the impact on third parties is undesirable, as with obesity, we call the result a negative externality. A benevolent impact on an uninvolved third party is called a positive externality. A community experiences the positive externality of “lunchline redesign.”

    How to diminish a negative externality? Increase its source’s cost. How to encourage a positive externality? Make it cheaper to create.

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    Some Like It Hot?

    Oct 23 • Demand, Supply, and Markets, Economic History, Economic Thinkers, Environment, Innovation • 382 Views

    A warmer Detroit? A wetter New York? In the future world that UCLA professor Matthew Kahn describes, cities will adapt to climate change.

    Assuming that warming is gradual, populations will migrate and innovate. If San Diego becomes less habitable, people will leave for a more appealing climate in Detroit. Facing different weather conditions and a changing sea level, NYC would build new sewer and transport systems. Now in New Orleans, Brad Pitt’s “floatable homes” might spread to other water threatened communities. Worsened drought conditions in the Southwest could lead to water efficient technology. Market opportunities could abound for entrepreneurs.

    The Economic Lesson

    When Simon Kuznets developed national income accounting during the 1930s, for the first time the U.S. could more accurately determine its productive capacity. Consequently, during the Second World War, we were better able to determine how many tanks, for example, our land, labor, and capital could produce.

    With a global warming trend, economists again could play a crucial role, assessing newly created incentives, investigating resource allocation, and identifying new markets and mobility.

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    Mobile Home Ceilings

    Oct 22 • Demand, Supply, and Markets, Regulation • 440 Views

    When the Ukiah California City Council said yes to rent stabilization for a local mobile home park, senior citizens said, “Thank you.” In NYC, 50% of all housing in Manhattan is rent regulated. Sixty years ago, concerned that the middle class would flee the city, NYC created a huge complete with rent regulated housing called Peter Cooper Village.

    Primarily on the demand side of the market, the benefits of rent control include affordable housing, a diverse population, a safety net for low income households, and acclaim for politicians who vote yes.

    The costs take us to supply. In Ukiah, the one party that opposed the new regulation was the owner of the mobile home park. Why? Depending on the stabilization level, a large or small proportion of the landlord’s revenue is diminished. If the blow is “life threatening” then landlords abandon unprofitable properties. Correspondingly rent control can lead to less building construction, poorer maintenance of rent-controlled buildngs, and housing shortages. Still functioning today, a complex tale of financial challenges surrounds Peter Cooper Village.

    Also, as sometimes happens, government regulation can lead to unintended consequences. Harvard’s N. Gregory Mankiw tells the story. In NYC, universities are purchasing rent-controlled buildings cheaply because landlords do not want them. As he explains it, because senior faculty are offered the inexpensive apartments, the school can pay them less. Faculty members are delighted because of their deal for city housing and the school is happy because of its salary and tax benefits. 

    The Economic Lesson

    Rent control is one of those “It’s complicated” topics. Economically, we can draw a demand and supply graph with a horizontal line below the point at which demand crosses supply. Called a ceiling, that line displays the below market price that rent control creates. Then, locating the point where demand crosses the horizontal line, and where supply crosses, we see that the quantity demanded exceeds the quantity supplied. The result? A shortage. 

    Would you vote for rent control?

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    Chinese Big Macs

    Oct 21 • International Trade and Finance • 470 Views

    At 14.5 yuan or $2.18, a Beijing Big Mac is cheap. In the U.S. the price is closer to $3.71. As explained by The Economist, we just need to know about the Big Mac to know what the yuan should really buy. Dividing $3.71 (a US Mac) by 14.5 yuan (Chinese Macs) means that 1 yuan should equal 26 cents. 

    But…in foreign exchange markets, 1 yuan equals 15 cents.

    The Economic Lesson

    How does money become more or less expensive? In foreign exchange markets, basically, it is all about demand and supply. For example, buyers tend to want more goods and services when a currency is cheap and less when it costs more. Correspondingly, if supply changes, it too affects a currency’s value.

    For the Chinese though, rather than the market, the value of their currency also responds to a supply that they control. For a more specific explanation, you can look here.


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