Big questions hang over Piketty’s work –

“The FT’s [Financial Times’] replication [and criticism] of Prof Piketty’s results was only possible because he published all his sources and spreadsheets online. Open data are a welcome fashion in economics and Prof Piketty should be lauded for embracing it. Capital in the Twenty-First Century calls for important policy changes, including an international wealth tax. It is essential that the data on which he draws his conclusion are subject to public scrutiny.