The idea below belongs to someone named
Elite Yoda, I found it
here : https://www.startjoin.com/exchange
This is a perfect use case for BitShares.
"The concept of an online local barter exchange is the idea to allow local communities online access to a virtual exchange to barter for goods or services.
The online local barter exchange would exist as a distributed application using the Ethereum application development platform. The application could be built as a mobile app to be used on consumer mobile cell phones, tablets or home personal computers. The application network would be decentralized and so the database of existing users, barter items and total pooled cryptocurrency in use for each local exchange would be stored on the blockchain.
Consumers in a particular region would download the app and the network would use IP localization to calculate the new users latitude and longitude. The app would then construct an array of regions with which the user can interact. The most local region would be an area defined in square kilometers by a radius set by the user. The next less local region would be a larger area set by the user, and so on until the localization was set to the users country. The largest and least localized region would be the user's country. The search results would return all of the items up for barter within a certain price within the users region or vicinity based upon the users settings. As the user increased the region radius setting, the search results would likely return a greater number of results; items up for barter. However, the purpose of the app would be to easily allow users to match up prices of items for which they would like to trade.
Each item would have an ASK price set by the seller and a BID price set by any other user seeking to trade for that item. Users do not have to only trade item for item, they would be able to pay for the item at the ASK price using an established cryptocurrency such as MaxCoin.
The cryptocurrency used for pricing bartered items would be a newly created virtual currency only for use within the specified region (layer). Each layer would be defined as a particularly sized region based upon a certain radius along with the transaction activity (barter liquidity) occurring over that region/layer in a given period of time. There would be a myriad layers and a multitude of different cryptocurrencies across the entire network within a particular country. The supply of coins within a particular region would begin at a level depending upon the initial transactional activity the network calculates there to be in existence in that region/layer. This initial coin supply to activity relationship would be inverted, so that in a desolate area with effectively no activity, the coins set for that layer would be at a maximum, so intrinsic worth of each coin would be at its minimum. As barter activity increased within that layer, the value of each crypto coin set for that layer would increase, as the coin supply diminished. The exchange rates between the coins of various layers would be automatically calculated and set periodically by the network of distributed applications and these rates would be set by comparison between the relative values of the cryptocurrencies with regard to their own layer's activity. Therefore successfully executed barter transactions within a layer which has a higher level of activity would yield a more favorable exchange rate for the user to place a bid or ask within another layer. This would tend to be a driving force for users to begin seeking out items for which to barter in less active layers, possibly farther out from their current locations in physical space.
At the country layer level, the network would define an exchange rate for the country cryptocurrency against other established bitcoins such as MaxCoin and others. In this way, users could either sell items and only accept an exchange of their goods for that layers cryptcurrency, or, buy-in starting at the country layer using an established bitcoin, to then have a store of currency for the purchase of items up for sale within the network.
Users would have the ability to set up whatever method of physical exchange (mail delivery, drop off, hand to hand, etc) for the items they desired but all transactions would be performed and completed prior to the physical exchange. The network would simply be a public system of accounting for the transactions occurring between parties. Each party would be responsible for successfully receiving goods. For instances of fraud or failed transactions, the users currency would be returned to the users account. For purchase transactions and for barter exchanges, if a transaction fails for some reason, the user(s) would receive a virtual negative rating. After a certain number of negative ratings the users account would be deleted and the paypal and/or bitcoin wallet used to setup the account initially would be banned from the system. In order to keep fraud and initially failed transaction barter rates to a minimum, the initial set up of a user at the country layer would only be able to buy-in with a very small amount in bitcoins; on par with the price in Euros of a few loaves of bread or a few gallons of milk. With each successful barter, sale or purchase transaction the user would receive a positive rating. As the reputation rating increases so does the ability to buy-in at a greater level using established bitcoins at the country layer.
The online local barter exchange would provide a multitude of market places based upon a myriad defined regions within a country, all with their own cryptocurrencies for which the worth would be dependent on the transactional activity of the localized regions and the entire country. The greater the number of users, the larger and more diverse the barter exchange and marketplace would be."
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