The best replacement for expansion is contraction.

The best alternatives to expansion are rated as following:
★★★★★  contraction
★★★  extension
★★  recession
★★  control joint
★★  compression
★★  freeagent
★  goflex
★  free agent
★  penetration
★  diversification
★  control joints
★  non expansion bearing
★  dlc
★  backup plus
★  exploration eu4
  extraction
  seagate backup plus
  earnings growth
  seagate freeagent
  isolationism
  relocation
  concentration
  explosion
  contraction economics
  vertical expansion

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Speaking about expansion, one probably shouldn't forget about inflation.

Other search terms related to expansion and their ratings are:
★★★★★ inflation
★★ pascal's triangle
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Google Trends

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expansion
contraction
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