by DAN WAKEFIELD
290 pages. Delacorte. $7.95.
Built-in obsolescence was one of the great ideas of the 1950s. For the sake of the G.N.P., it was better if appliances and autos did not last too long. Now, nostalgia notwithstanding, it appears that perhaps the youth of that period were not put together too well either. Phil Potter, 33, came of age in the 1950s, went into public relations and married a model. Five years later, he watches his marriage fall apart.
Like the nearly 2,000,000 Americans who get divorced each year, Potter then...