Most data sets used by economists are collected with after-the-fact surveys and the time aggregation is done by the survey respondents who produce, for example, monthly aggregates not actual transactions. 21st century digital transaction technologies will increasingly allow the collection of...

"This paper uses a Ceridian transaction-by-transaction data set on purchases of diesel fuel by over-the-road truckers to form a monthly diesel volume purchase index from 1999 to 2011, purged of weekday, holiday and calendar effects. These high-frequency data support a new and improved set of...