1. Cellphones for selfish users
Elan Pavlov
MIT Media Lab

2. Power for cellphones
Power usage is cellphone is a function of the distance to the destination.
Depending on the terrain the power usage is between distance2-distance4.

3. Example
Peer
Caller
Destination
Possibility 1
Peer

4. Example
Peer
Caller
Destination
Peer

5. Peer
Caller
Destination
Peer

6. Peer
Caller
Destination
Peer

7. Saving power Why not use hopping for cell phones?
People are selfish and the person who agrees to forward can have her cellphone battery depleted faster.

8. Our solution We offer a simple guarantee: Based on a system of debt.
“If you agree to forward for others your battery will always last at least as long as if you don’t”.
Based on a system of debt.
We also have debt forgiveness.