Naoki Yoshihara - Reexamination of Marxian Explotation Theory
Profit, Surplus Product, Exploitation and Less than Maximized Utility: A New Equivalence Proposition...
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Transcript of Profit, Surplus Product, Exploitation and Less than Maximized Utility: A New Equivalence Proposition...
Profit, Surplus Product, Exploitation and Less than
Maximized Utility: A New Equivalence
Proposition on the Fundamental Marxian Theorem
Tadasu Matsuo
Metroeconomica, 59-3, 2008
The Problem
• The Fundamental Marxian Theorem Okishio(1955)The positive profit exists if and only if there is the exploitation of labor.
From my brain cache
The Problem
• Petri’s (1980) criticism “Profit without exploitation”
Commodity 2
Commodity 1
ly
lR
p
p
RR2
yy2
y1
y : net products per unit labor
R : real wage rate bundle
A New Exploitation Concept
• Matsuo’s(1994) solution
Commodity 2
Commodity 1
y
R
y2
R2
y1
z
Introducing worker’s indifference curve.
Workers could work less to maintain their welfare than they actually do work.
Exploitation!
Washida (1988) Kawaguchi’s (1994) System of Exploitation Theory
• The Profit Warranty Condition
• The Surplus Condition
• Exploitation Defined with Effective Value Vector (EVV)
• Exploitation Defined with Minimized Labor
The 4 conditions below are equivalent.
The Strong System of Exploitation Theory
The Profit Warranty Condition
• There exist production processes that yield a positive profit under any semi-positive price vector.
¬∃p≥0, p(B−A−Rτ)≦0
This is equivalent with “warranted rate of profit is positive.” (Kawaguchi, 1994)
The Surplus Condition
• There exist semi-positive activity vectors, that yield positive surplus products for all commodity types.
∃x≥0, (B−A−Rτ)x≥0
• The value of the real wage basket for unit labor, evaluated by any semi-positive labor value vector that is calculated from the most labor-productive combinations of the available techniques, is less than unity.
∀t∈{t | t(B−A)≦τ, t ≥ 0, t(B−A)<τ}, 1-tR>0
Exploitation Defined with EVV
Exploitation Defined with Minimized Labor
• The minimum labor necessary to produce the real wage basket for unit labor is less than unity
1>minτx s.t. (B−A)x≧R, x≥0
By Figure
The Surplus Condition
• ∃x≥0, (B−A−Rτ)x>0Commodity 2
Commodity 1
R
y
The Profit Warranty Condition
• ¬∃p≥0, p(B−A−Rτ)≦0
Commodity 2
Commodity 1
R
y
ly
lR
p
p
Before showing the Exploitation Defined with EVV
• We must interpret this type of labor value vector.
t∈{t | t(B−A)≦τ, t ≥ 0, t(B−A)<τ}
Suppose there are many processes.
Commodity 2
Commodity 1
net products per unit labor
Compare A and B.
Commodity 2
Commodity 1
A is inferior to B for the labor productivity.
A
BThus we vanish A.
All these are vanished.
Commodity 2
Commodity 1
These remain.
How about this.
Commodity 2
Commodity 1
Combine these two processes.
Net products on this segment can be produced.
This is inferior, thus vanished
Net Production Possibility Frontier per Unit Labor
Commodity 2
Commodity 1
Net Production Possibility Frontier per Unit Labor
Commodity 2
Commodity 1
If there are sufficiently many processes.
We can approximate this as a curve.
Then we can show this labor value vector as…
Commodity 2
Commodity 1
t∈{t | t(B−A)≦τ, t ≥ 0, t(B−A)<τ}
1/t2
1/t1
• ∀t∈{t | t(B−A)≦τ, t ≥ 0, t(B−A)<τ}, 1-tR>0
Now,Exploitation Defined with EVV
Commodity 2
Commodity 1
1/t2
1/t1
R
tR/t1
tR/t2
Exploitation Defined with Minimized Labor
• 1>minτx s.t. (B−A)x≧R, x≥0Commodity 2
Commodity 1
R
y
This equivalence system does not encompass the type of
positive profit expressed in the Petri’s (1980) criticism.
The Surplus Condition does not hold here.
Commodity 2
Commodity 1
R
y
Then
Commodity 2
Commodity 1
R
y
ly
lR
p
p
Then
Commodity 2
Commodity 1
R
y
ly
lR
p
p
Then
Commodity 2
Commodity 1
R
y
ly
lR
p
p
Then
Commodity 2
Commodity 1
R
y
lylR
p
p
There is a case of no profit
Commodity 2
Commodity 1
R
y
lylR
p
p
p2=0
AndCommodity 2
Commodity 1
1/t2
1/t1
R
tR/t1
tR/t2
AndCommodity 2
Commodity 1
1/t2
1/t1
R
tR/t1
tR/t2
AndCommodity 2
Commodity 1
1/t1
R
tR/t1
There is a case of no Exploitation Defined with EVV
Commodity 2
Commodity 1
=1/t1
R
tR/t1
t2=0
And there is no Exploitation Defined with Minimized Labor.
Commodity 2
Commodity 1
R
y
Here I proposed an alternative system
• The Weak Profit Warranty Condition
• The Weak Surplus Condition
• Exploitation Defined with Narrow Effective Value Vector (NEVV)
• Exploitation Defined with Minimized Labor for Equal Utility (MLEU)
The 4 conditions below are equivalent.
The Weak System of Exploitation Theory
The Weak Profit Warranty Condition
• There exist production processes that yield a positive profit under any positive price vector.
¬∃p>0, p(B−A−Rτ)≦0
The Profit Warranty Condition
• There exist production processes that yield a positive profit under any semi-positive price vector.
¬∃p≥0, p(B−A−Rτ)≦0
The Weak Profit Warranty Condition
• There exist production processes that yield a positive profit under any positive price vector.
¬∃p>0, p(B−A−Rτ)≦0
The Weak Profit Warranty Condition is satisfied here.
• ¬∃p>0, p(B−A−Rτ)≦0Commodity 2
Commodity 1
ly
lR
p
p
RR2
yy2
y1
These lines must be sloped
The Weak Surplus Condition
• There exist semi-positive activity vectors, that yield positive surplus products for at least one commodity types.
∃x≥0, (B−A−Rτ)x≥0
The Surplus Condition
• There exist semi-positive activity vectors, that yield positive surplus products for all commodity types.
∃x≥0, (B−A−Rτ)x>0
The Weak Surplus Condition
• There exist semi-positive activity vectors, that yield positive surplus products for at least one commodity types.
∃x≥0, (B−A−Rτ)x≥0
This satisfies the Weak Surplus Condition
Commodity 2
Commodity 1
R
y
Surplus product
• The value of the real wage basket for unit labor, evaluated by any positive labor value vector that is calculated from the most labor-productive combinations of the available techniques, is less than unity.
∀t∈{t | t(B−A)≦τ, t > 0, t(B−A)<τ}, 1-tR>0
Exploitation Defined with NEVV
• The value of the real wage basket for unit labor, evaluated by any semi-positive labor value vector that is calculated from the most labor-productive combinations of the available techniques, is less than unity.
∀t∈{t | t(B−A)≦τ, t ≥ 0, t(B−A)<τ}, 1-tR>0
Exploitation Defined with EVV
• The value of the real wage basket for unit labor, evaluated by any positive labor value vector that is calculated from the most labor-productive combinations of the available techniques, is less than unity.
∀t∈{t | t(B−A)≦τ, t > 0, t(B−A)<τ}, 1-tR>0
Exploitation Defined with NEVV
Exploitation Defined with NEVV is satisfied here.
Commodity 2
Commodity 1
1/t2
1/t1
R
tR/t1
tR/t2
These lines must be sloped
Exploitation Defined with MLEU• The minimum labor necessary to produce the
commodity bundle which does not decrease worker’s utility of any worker’s utility function than real wage basket for unit labor, is less than unity.
∀u∈U 1>minτx s.t. (B−A)x≧z, x≥0, u(z)≧u(R)
U is a set of the functions which are strictly increasing and continuous.
Exploitation Defined with MLEU exists here.
• This is Matsuo’s(1994) solution.Commodity 2
Commodity 1
y
R
y2
R2
y1
z
I proved the equivalence between these four conditions.
The Weak Surplus Condition
Exploitation Defined with MLEU
Exploitation Defined with NEVV
The Weak Profit Warranty Condition
And then I showed an another condition equivalent with
these.
Consider the workers’ utility for the working hours.
Assumptions
• A worker’s utility function u is an element of the function set U, which is given as follows:
U={u : Rm+×R1
+ (∋(y, T))→R1 | (i) y1≥y2⇒u(y1, T)>u(y2, T), (ii) u is continuous}
• Each worker’s labor time T has the upper limit T. That is, T≦T.
Definition
• A worker’s maximum utility umax is defined as:umax=max u(y,τx), s.t. (B−A)x≧y, x≥0 y, x
Since 0≦τx≦T and hence y is bounded by the constraint, then u is a continuous function from a compact set to a one-dimension real number. Then, from The Weierstrass Theorem, there is a maximum value of u.
Proposition
• ∃x≥0, (B−A−Rτ)x≥0 ⇔ u(RT, T)<umax, for any u∈U
That is; The conditions of the Weak System of the Exploitation Theory are equivalent to the situation in which the utility for any worker from the present real wage bundle and working hours is less than the maximum utility, which could be obtained from free access to all the processes of the entire economy.
A new controversy after submitting the paper.
• Yoshihara’s(2005) criticism against FMT.A case of positive profit without exploitation under different consumption bundles of workers.
Commodity-1
Commodity-2
R= (0.75,0.75)y= (1,1)
1.51
1.5
1
R 2
R 1
Matsuo’s(2007) refutation.• If 2 workers of both types work 0.75 each,
1.5 of each commodity are produced and both workers can get their reward of 1 labor.
Commodity-1
Commodity-2
R= (0.75,0.75)y= (1,1)
1.51
1.5
1
R 2
R 1
Exploitation
0.75<1
Then I must change The Weak System of the Exploit
ation Theory to extend to the situation of the
workers’ different consumption bundles.
• Matsuo’s(2007) proof supposes homo-thetic utility functions. → Generalize!
Perhaps the last condition of The Weak System will be;
• for any i, ui(Ci, Ti)<uimax, pCi≦wTi
That is; Non-exploitation situation is that each worker can achieve an optimal reproduction without pre-constraint of the means of production.
A case of non-exploitation
YUA
UB
EA*
EB*
LALB
Net products
Labor
Roemer’s non-exploitation is;
Y
P
LZ
UA
UB
Distributing equal means of production represented by point P.
But production at P is not optimal for each worker.
Net products
Labor
Roemer’s non-exploitation is;
Y
E
P
LZ
UA
UB UA′UB′
EAEB
LALB
Π
YA
YB
ΔY
ΔY
ΔLΔL
Net products
Labor
B rents A some amounts of means of production which requires ΔL labor, and gets ΔY interest.
→Better off.
If initial endowments increase,
Y
E
P
LZ
UA′UB′
EAEB
LALB
Π
YA
YB
ΔY
ΔY
ΔLΔL
Net products
Labor
If initial endowments increase,
YE
P
LZ
UA′
UB′
EA
EB
LALB
Π
YA
YB
ΔY
ΔY
ΔLΔL
Net products
Labor
Interest rate decreases.
If initial endowments increase,
YE
P
LZ
UA′
UB′
EA
EB
LALB
Π
YA
YB
ΔY
ΔY
ΔLΔL
Net products
Labor
Interest rate decreases.
Converge to my non-exploitation situation.
Y
P
LZ
UA′
UB′
EA
EB
LALB ΔLΔL
Net products
Labor
To prove this is my goal.
Interest rate converges to zero.