Related: cycle
Time is one difference between sources and objects.
Renting a physical source can be thought of as buying time at a rate totalling all costs.
The potential for exclusion
EndTime.com >>Revealing the Future Through Bible Prophecy
TimeBucks.org >>Use this site to share your skills and find services you need. Posted services are usually less formal and less profit-oriented than other directories. Most people who provide services just want to share a talent or support an organization they care about.
TaskJuggler.org >>TaskJuggler is a modern and powerful project management tool. Its new approach to project planning and tracking is far superior to the commonly used Gantt chart editing tools. It has already been successfully used in many projects and scales easily to projects with hundreds of resources and thousands of tasks.