1. •ether.- due to its misuse, the sale requires a prescription. Is used in some surgical procedures,
although actually its use is restricted due to misuse.
•Phone.- most people have phones at home because it´s not so expensive to have. Is a great invention
because is easier for people to communicate but, at the beginning was not so available and not easy
to have one at home.
•Cash machine.- more accurate accounts and for use in too large accounts have greater accuracy and
reliability. Its use became more accessible to perform accounts and record accounts in stores.
•Automobile.- not all the people could buy one and, only until its mass production became
accessible for purchase. Made easier in the short and long transportation distances and eliminated
the dependence on other modes of transportation.
•Microwave.- is not too expensive to purchase but, its is too expensive for the power consumption,
one hour of use is around 13 pesos..their use has facilitated the process of heating food and save time
in cooking.
•Computer.- if you need to use a computer you can go to a cyber store. Most people know or want to
learn to use it because it is necessary, also as a communication way.
•Polio vaccine.- is so available without affect the economy of the people if has a medical care
agreement; otherwise it can sometimes be expensive. It eliminates the risk of bulbar polio and post
polio syndrome.
•Electronic poker calculator.- it is not too expensive to acquire one. It helps to have more accurate
calculations.
•Artificial heart.- is expensive but, for urgency situation can help to save a life. It is used on a
temporary basis in some heart transplant candidates who are awaiting for a heart donor, but urgently
needed to replace his heart and he is very ill.