Aside from the retailer's gross margin of 35%, the biggest component of cost is labor: Even when a Mille is 99% completed, the tiniest flaw can cause it to be rejected.

FORBES: Magazine Article

The result was that the cost per mile for consumers on the ethanol component of their fuel was double or even triple the cost of the gasoline component.

FORBES: Washington's Foolish Fuel Policy

The study provides "strong evidence that text message reminders can be an effective, low-cost component of such a package".

BBC: Text messages boost malaria care