In this way encapsulation protects the object from being tampered with and frees the programmer from having to know the details of the object's implementation. In our StockOption example the outside programming environment does not need to be exposed to the method of calculating the price, and so this functionality is encapsulated and made unavailable to the outside world. Then Proof. Contrary to the suggestion of Lawrence and Slaughter (1993), we argued that the movements in product prices (combined with growth in productivity) are fully consistent with the increase in the relative wage of skilled labor in the U.
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