For information on the number 1000, see 1000 (number).
Thousand is the name of a single released by techno artist Moby, which has the world record for the fastest tempo in beats-per-minute (BPM) of any released single. It clocks in at approximately 1,000 BPM, hence the title of the recording.
The married primary earner with the sixty thousand income and no income from his or her spouse would continue to pay eight thousand four hundred in tax, which would continue to give them a lower tax rate from the twelve thousand in tax they were paying in 1913.
This tax benefit for the married single earner couple also translates into a tax punishment to the unmarried single earner couple for their choice to not get married, which might be seen as unfair to the latter.
Single earner families would, of course, seriously object to such an abdication, since the benefits they currently receive relative to two singles with the same net income and equal earning families with the same net income under the current progressive tax system would be completely stripped away.