My
dear
Matthew, Trade
always
results
in
an
increase
in
total
well-being.
If
you
have
x
and
I
have
y
and
we
voluntarily
trade
some
x
for
y
our
total
well-being
must
increase.
After
all
I
won't
give
up
some
x
unless
I
value
it
less
than
the
y
I
get
and
you
won't
give
up
y
unless
you
value
it
less
than
the
x
you
get.
However
this
aggregate
formulation
hides
rather
than
reveals
truth.
Even
though
overall
well-being
increases,
parts
of
me
and
parts
of
you
are
very
likely
to
be
worse
off
than
before.
For
example
suppose
we
initially
each
grew
tomatoes
in
our
gardens
and
wrote
on
economics
(to
each
other).
At
some
point
I
tire
of
economics
writing
and
offer
to
grow
extra
tomatoes
which
I
can
sell
to
you
in
return
for
writings
on
economics.
I
now
grow
tomatoes
and
you
write
economics
letters
and
we
trade
some
of
those.
There
is
no
doubt
that
we
will
each
be
far
more
productive
as
exclusive
tomato
grower
and
economics
writer.
In
other
words
overall
well-being
will
undoubtedly
increase.
However
my
economics-writing
side
will
wither
and
so
will
your
tomato-growing
side.
We
will
each
be
a
shadow
of
our
selves,
producing,
producing,
producing
but
shrivelling
inside. Is
it
hard
to
understand
how
a
country
specializing
as
classical
economics
would
have
it
do
would
shrink
and
wither
even
as
its
gross
domestic
product
expanded?
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