opposite effect;  adverse effect;  backfiring
 exceptionally effective;  overwhelming effectiveness
 impact of publicity or propaganda
 having an immediate effect;  taking immediate effect
 (positive) economic effect
 to bear fruit;  to take effect
 having an immediate effect;  taking immediate effect
 (medicine with) a curative effect;  (having) therapeutic value
 butterfly effect (chaos theory)
 visual effect(s) (e.g. in a film)
 deterrent effect;  chilling effect;  restraining effect
 ripple effect;  spillover effect;  propagation effect
 effectiveness of advertising
 Barnum effect;  Forer effect
 having an immediate effect;  taking immediate effect
 cost-effectiveness;  price-performance ratio
 Concorde fallacy;  Concorde effect;  sunk cost fallacy
 customer appeal;  the power to appeal to customers
 stack effect;  chimney effect
 multiplier effect (econ.)
 alienation effect;  Verfremdungseffekt
 Mössbauer effect;  recoilless nuclear resonance fluorescence
 Raman effect (of inelastic photon scattering)
 Field Effect Transistor;  FET
 shear effect;  shearing effect
 shower effect (theory that placing high-selling items on the upper floors of a department store will lead to increased sales in the lower floors)
 Edison effect (thermionic emission from a heated metal or semiconductor)
 Trump Effect;  impact on business of the election of Donald Trump as US president
 Polyanna principle;  Polyanna effect
 stuck song syndrome (esp. fragment of a song)
 fountain effect (theory that high sales in the basement of a department store lead to increased sales in the upper levels as well)
 shear effect;  shearing effect