Saiu na Revista de Economia Política!

Saiu o artigo! Já disponível para baixar no site da revista, mas ainda não no Scielo. O texto utiliza dados da minha dissertação de mestrado, retrabalhados.

Price synchronization in retailing: some empirical evidence

Marcelo Resende, Rodrigo Zeidan e Gabriel Rega

The paper investigates the synchronization of price changes in the context of retail tire dealers in São Paulo-Brazil and ed items in supermarkets for cleaning supplies and food in Rio de Janeiro-Brazil. Results indicate similar and non-negligible synchronization for different brands, although magnitudes are distant from a perfect synchronization pattern. We find interesting patterns in inter-firm competition, with similar magnitudes across different tire types. Intra-chain synchronization is substantial, indicating that a common price adjustment policy tends to be sustained for each chain across different products.

via Revista de Economia Política.

O sonho do economista

Conhecimento total de todas as variáveis e regras de funcionamento.

A multiplayer game environment is a dream come true for an economist. Because here you have an economy where you don’t need statistics. And elaborate statistics is what you use when you don’t know everything, you’re not omniscient, and you need to use something in order to gain feeling as to what is happening to prices, what is happening to quantities, what’s happening to investments, and so on and so forth. But in a video game world, all the data are there. It’s like being God, who has access to everything and to what every member of the social economy is doing.

via “A Multiplayer Game Environment Is Actually a Dream Come True for an Economist” – Reason.com.

How Long Should the Working Day Be?

Postado originalmente em The NEP-HIS Blog:

Cold, Calculating Political Economy': Fixed costs, the Rate of Profit and the Length of the Working Day in the Factory Act Debates, 1832-1847

By Steve Toms (Leeds University Business School)

URL: http://econpapers.repec.org/paper/pramprapa/54408.htm

The paper re-analyses the evidence presented by pro and anti-regulation interests during the debates on factory reform. To do so it considers the interrelationship between fixed costs, the rate of profit and the length of the working day. The interrelationship casts new light on the lobbying positions on either side of the debate. It does so by comparing the evidence presented in the debates before parliament and associated pamphlets with actual figures contained in the business records of implicated firms. As a result the paper identifies the compromise position of the working day length compatible with reasonable rates of profit based on actual cost structures. It is thereby able to reinterpret the validity of the claims of contemporary…

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Can We do Better than R-squared?

Postado originalmente em Learning as You Go:

If you’re anything like me, you’ve used Excel to plot data, then used the built-in ?add fitted line? feature to overlay a fitted line to show the trend, and displayed the ?goodness of fit,? the r-squared (R2) value, on the chart by checking the provided box in the chart dialog.

The R2 calculated in Excel is often used as a measure of how well a model explains a response variable, so that ?R2 = 0.8? is interpreted as ?80% of the variation in the ‘y’ variable is explained by my model.? I think that the ease with which the R2 value can be calculated and added to a plot is one of the reasons for its popularity.

There’s a hidden trap, though. R2 will increase as you add terms to a model, even if those terms offer no real explanatory power. By…

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Piketty’s “Capital,” in a Lot Less Than 696 Pages

Harvard Business Review:

Resenha pouco crítica (“nem a favor nem contra”) mais pro lado do resumo mesmo.

Postado originalmente em HBR Blog Network - Harvard Business Review:

It was only published in English a few weeks ago, but French economist Thomas Piketty’s Capital in the Twenty-First Century has already become inescapable. The reasons start with the confluence of subject matter and author. There’s a lot of interest in economic inequality these days, and research conducted over the past 15 years by Piketty, a professor at the Paris School of Economics, is a big reason why. In the U.S., Piketty and UC Berkeley’s Emmanuel Saez transformed a tame discussion of income quintiles and deciles into a sharp debate about the skyrocketing incomes of the 1% — and the mind-boggling gains of the 0.1% and 0.01%  — by gathering and publishing income tax data that nobody had bothered with before. Piketty was behind similar projects in France, Britain, Japan, and other countries.

And now this book. It is massive (696 pages) and massively ambitious (the title is a very…

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Instalando o LaTeX

Dica do Hyneman, que tem um ótimo site sobre previsão e estatística (inclusive com livro-texto grátis). LaTeX é uma linguagem de marcação que facilita na hora de escrever artigos com fórmulas. Você escreve o texto usando os marcadores e depois um programa “traduz” para o formato de revista tradicional.

MS-​​Windows

Down­load and run the setup pro­gram for Mik­TeX. Choose the “basic” system.

Down­load and run the installer pro­gram for TeXs­tu­dio.

Then run TeXs­tu­dio and start typing.

via Hyndsight – Getting a LaTeX system set up.

Economic Thought Vol3.n1

Nova edição saindo.

Economic Thought, the online-based journal of the World Economics Association, accepts article submissions from scholars working in the history of economic thought, economic history, methodology of economics and philosophy of economics. The journal welcomes articles addressing all aspects of the aforementioned sub-disciplines with an emphasis on original and path-breaking research.

Meu destaque é o artigo:

A commentary on Alessandro Roncaglia’s paper: ‘Should the History of Economic Thought be Included in Undergraduate Curricula?’

Nicholas J. Theocarakis

Pra mim é uma discussão estranha, já que no meu currículo tinha isto. Então funciona ao contrário, descubro que argumentos poderiam ser usados para excluí-la, já que pra mim é uma inclusão óbvia.

via Economic Thought.