In another, still developing, section of the WishPop app, kids can play educational games and read stories, earning wish points along the way, which can later be exchanged for the items on their lists.
Opened laser or inkjet printers, fax machines and wireless PDAs may be exchanged for the same item within 30 days of shipping but not refunded.
Prehistoric humans used the barter system, whereby items like grain, cattle and services were exchanged for other items of equal value, such as grain, cattle and services.
But there is some momentum for the idea that personal data could function as a kind of online currency, to be cashed in directly or exchanged for other items of value.
Examples of cash-based interventions include both unconditional and multipurpose cash transfers, cash transfers with eligibility conditions (including cash for work), and vouchers that can be exchanged for specific items, services, or cash.
These include branded currencies like loyalty points that can be exchanged for physical items.
Setting records in the Mirage Arena earns players medals which can be exchanged for rare items in-game.
At the prison from the study, ramen cost 59 cents at the commissary but would be exchanged for items worth more in value.
Mojang spokesperson Owen Hill explained that server providers could accept donations from players, as long as these payments were not exchanged for items or power-ups that would give players advantages in the game world.
These tokens could be exchanged for items including "meals, extra dessert, visits to the canteen, cigarettes, time off the ward, time in the TV and game room, time in bedroom between 8am and 9pm, visitors, books and magazines, recreation, dances on other wards".
In a similar fashion to previous installments in the series, enemies often drop bolts after they are destroyed, and these can be exchanged for various restorative items and upgrades.
