@Robert Gentel,
Everyone should pay careful attention to the official reports of the Bureau of Labor Statistics. There one can find the Unemployment numbers going back for decades.
Economists generally agree on several key points--
a. Unenployment Numbers will vary---It might be noted that during President Clinton's first term, the Unemployment rate was higher than 6.1 % for 19 of his 48 months in office.
b. A 5% Unemployment rate( according to most economists means that employment is nearly at top since there are ALWAYS at least five percent of the population who have left one job and are looking for another.
c. Unemployment rates differ according to educational status. Those who are college graduates are always at the lowest rate of unemployment and are usually unemployed for the shortest time. Those, who for whatever reason, have been unable to obtain even a high school diploma are always overrepresented among the unemployed.
d. "Creative Destruction" of jobs throughout our History has always led to Unemployment. Those who made buggy whips soon learned that, due to the advent of the automobile, there would soon be no market for their product.
Those employed by the buggy whip industry who had skills, training or education which enabled them to go to another job, usually did well.