<s>
The	O
elasticity	B-Algorithm
of	I-Algorithm
a	I-Algorithm
function	I-Algorithm
is	O
a	O
constant	O
if	O
and	O
only	O
if	O
the	O
function	O
has	O
the	O
form	O
for	O
a	O
constant	O
.	O
</s>
<s>
The	O
elasticity	B-Algorithm
at	O
a	O
point	O
is	O
the	O
limit	O
of	O
the	O
arc	O
elasticity	B-Algorithm
between	O
two	O
points	O
as	O
the	O
separation	O
between	O
those	O
two	O
points	O
approaches	O
zero	O
.	O
</s>
<s>
The	O
concept	O
of	O
elasticity	B-Algorithm
is	O
widely	O
used	O
in	O
economics	O
and	O
Metabolic	O
Control	O
Analysis	O
;	O
see	O
elasticity	B-Algorithm
(	O
economics	O
)	O
and	O
Elasticity	B-Algorithm
coefficient	O
respectively	O
for	O
details	O
.	O
</s>
<s>
Rules	O
for	O
finding	O
the	O
elasticity	B-Algorithm
of	O
products	O
and	O
quotients	O
are	O
simpler	O
than	O
those	O
for	O
derivatives	O
.	O
</s>
<s>
In	O
economics	O
,	O
the	O
price	O
elasticity	B-Algorithm
of	O
demand	O
refers	O
to	O
the	O
elasticity	B-Algorithm
of	O
a	O
demand	O
function	O
Q(P )	O
,	O
and	O
can	O
be	O
expressed	O
as	O
(	O
dQ/dP	O
)	O
/	O
(Q(P )	O
/P	O
)	O
or	O
the	O
ratio	O
of	O
the	O
value	O
of	O
the	O
marginal	O
function	O
(	O
dQ/dP	O
)	O
to	O
the	O
value	O
of	O
the	O
average	O
function	O
(Q(P )	O
/P	O
)	O
.	O
</s>
<s>
The	O
semi-elasticity	O
will	O
be	O
constant	O
for	O
exponential	O
functions	O
of	O
the	O
form	O
,	O
since	O
,	O
</s>
<s>
An	O
example	O
of	O
semi-elasticity	O
is	O
modified	O
duration	O
in	O
bond	O
trading	O
.	O
</s>
