Presentation on theme: "Computer Science 313 – Advanced Economic Topics. Is This a Check or Money? Currency issued by Bank of the United States Once we figure that out: how."— Presentation transcript:
When ordering online, pay $0.0259 per check Under $0.01 of pen ink used on the check At cheapest, check worth little over 3.5 cents $0.15/check for really fancy ones I found Would need to supply your name & address Bank name & account number needed for this too
Generous Offer Following offer open to all students in class: I will trade $0.16 for your next signed paycheck My offer is VERY serious with contract ready Probably not high quality, expensive type of check Without additional value, you will end up richer
Patterns In Real-Life Usually worth more than their components They are both implementations of proxy pattern Checks are remote proxies, but in the real-world See working of virtual proxy with old U.S. currency Consider definition of the word "Proxy" Ally or friend whom you give power to work as if they were you; Agent;Substitute
Remote Proxy in Action Signed check is deposited into your account Client sees bank give them cash, but more needed To get cash, bank must follow several steps Image of useless paper made at local bank branch Bank then has image sent to local clearinghouse Request routed to source bank for approval Other bank has check amount deducted from account Approval sent to clearinghouse as electronic transfer Clearinghouse has result sent back to your bank
Virtual Proxy Silver & gold standard currency virtual proxies Bills still (nearly) worthless paper & ink creation Fed reserve banks kept vaults of gold and silver Trade for bill for gold/silver at any of these banks This is simpler proxy, no 3 rd party needed!
For Next Class Lab due Friday before noon Still have 1 hour! Last lab available now on Angel Continue reading on our last design pattern