-16-
TLble I.--Estimated structural parameters for constant and varying parameter specifirationsa

 Constant para eter structural I odels Varyin pcarameter models
variable endent arales Oependent ariables
Variable NFCs FCS PORK SRP :-FCS ;O-RK SP"R -

XFCS -1 -.150 -.00453 .1 -.00319
 (2.52) (5.20) (3.09)
FCS -1 -.00844 -.00825
 (5.7S) (5. 1)
PORK -1 -.00675 .1 ..00564
 (4.14) (3.48)
SPR .1 -1
INTERCEPT .1314 261Z -130 124 2106 -110 113
 S195 -145
 (1.02) (1.01)

 03 364 319
 (1 .86) (2.02)
Q4 657 623
 (3.37) (3.99)
1FCSt.2 .335 .186
 (3.74) (1.35)
ZSPRt- i -60.6 -69.1
 (3.00) (2.75)
3FC ~. 26.0 25.5
 (7.00) (S.73)

Placet.2 .324
 (2.30)
Qz*Place -.122
 St-2 (2.71)

,*Pl:ca -.192
3 p2 ( .7)

Q4*Plac -.022
 4 t-2 (.76)

 Place. .398
 ct-3 (2.80)

 Fart-2 .691 .687
 (8.4) (9.13)
 Ql*Farrt-z -.153 -.151
 (2. 79) (3.00)
 Farrt.3 .611 599
 (4.50) (4.68)
 iPn1 5.71 5.65 .45
 S(.3) (1.45)49
 Time .388 .463 .01
 (3.59) (4.45)


 R2 .936 .763 .828 .799


 c 126632 83706 29967 6.03 COS6 23056 2.19

 Ow 1.54 2.04 1.11 1.63


 aFigures in parentheses represent approximate t-values.