and this is a problem when estimating log-linear gravity equations. This has caused many researchers to either ignore the zero trade flows or to replace the zero with a small positive number. Both of these actions bias the resulting parameter estimates of the gravity equation. In this study we...

When analyzing bilateral trade flow data, zero trade flows are quite common and problematic when a gravity equation is estimated with a log-linear functional form. This has caused many researchers to either ignore the zero trade flows or to replace zero with a small positive number. Both of...

Despite the presence of food miles labels and carbon labels on the market for many years, relatively little data is available on how consumers respond to these labels. It is one thing to show people saying in surveys they will use carbon labels, and quite another to have evidence of people...