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TRANSITION DEBT PATH (Paper 3: 102% -> band 30-60%, centre ~45% by ~Yr26)
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Central case: real growth 2.0%, inflation 2.0%, coupon 4.5%->3.0%, KT 1.5% of M2
   Year  debt/GDP   GDP($T)  cumKT($T)
      5      96%     37.5       1.8
     10      84%     45.6       4.0
     15      71%     55.5       6.8
     20      58%     67.5      10.0
     25      46%     82.1      12.0
     30      45%     99.9      12.0
     35      45%    121.5      12.0
     40      45%    147.9      12.0
     45      45%    179.9      12.0
     50      45%    218.9      12.0

Enters band (<=60%): Year 20.  Reaches centre (~45%): Year 26.
Cumulative KT to stabilise in band: $12.0T.
Citizen seigniorage freed by holding the band (not over-retiring): $39.4T over 50y.

CONSISTENCY WITH PAPER 3 TABLE 2:
  Year 10: model 84%  vs table 84%  [OK]
  Year 20: model 58%  vs table 58%  [OK]
  Year 30: model 45%  vs table 45%  [OK]
  Year 45: model 45%  vs table 45%  [OK]
