“Relative income uses two variables: the dollar and time, usually hours.”

“Psychological motivation is the desire to change relations between two points, and so psychology is the study of equations with two unbound variables. ("America: Three Audiences")”

“On savings: A dollar here, a dollar there. Over time, it adds up to two dollars.
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“Above a certain level of income, the relative value of material consumption vis-a-vis leisure time is diminished, so earning a higher income at the cost of working longer hours may reduce the quality of your life. More importantly, the fact that the citizens of a country work longer than others in comparable countries does not necessarily mean that they like working longer hours. They may be compelled to work long hours, even if they actually want to take longer holidays.”

“You can't measure time by days, the way you measure money by dollars and cents, because dollars are all the same while every day is different and maybe every hour as well.”

“Compound actions on shared state, such as incrementing a hit counter (read-modify-write) or lazy initialization (check-then-act), must be made atomic to avoid race conditions. Holding a lock for the entire duration of a compound action can make that compound action atomic. However, just wrapping the compound action with a synchronized block is not sufficient; if synchronization is used to coordinate access to a variable, it is needed everywhere that variable is accessed. Further, when using locks to coordinate access to a variable, the same lock must be used wherever that variable is accessed.”