Rappel:%la%/01%est%la%(2%**"+3&%3&454,&'%&,4&#"2#6,47"+3&*)*789":6%%et%la%(2%**"+3&9+72"#%%est%=%/;<&=&/01&
>/?@A&
%
@+62B%&'%&C+3#7"+3&54*#6,4"2%&+6&'%&2%7+62&5%"3%6D&E&
%
Cette%courbe%représente%les%542"47"+3*%de%/01%(PVC)%en%C+3#7"+3%'8B"7*'"4:6%%
Elle%représente%également%les%542"47"+3*%du%2%7+62&5%"3%6D%en%fonction%de%la%/01.%Cette%courbe%est%appelée%
#+62B%&'%&F2%7+62&5%"3%6DF&
Quand%le%'8B"7*'"4:6%&46-9%37%,%la%/01&'"9"36%%et%quand%la%/01&46-9%37%,%le%2%7+62&5%"3%6D&
'"9"36%G%
La%(2%**"+3& 9+)%33%& '%& 2%9(,"**4-%& 54*#6,4"2%%(/925)%est%déterminée%par%la%2%,47"+3%entre%le%5+,69%&
*43-6"3%et% la% #+9(,"43#%& 5%"3%6*%% (2%,47"+3& #+37%3437& =& #+37%36).%La%/925%est% illustrée% par% la% relation%
entre%'8B"7,%/?@%et%/;<&
%
!&1"CC82%37%*&2%,47"+3*&E&
À%/01&8-4,%,%le%2%7+62&5%"3%6D%sera%plus%"9(+27437%si%H?+,%ou%I@5%
À%'8B"7&8-4,,%la%/01%est%plus%-243'%%si%H?+,%ou%I@5%
À%/01&8-4,%,%le%2%7+62&5%"3%6D%sera%plus%"9(+27437%si%I&J?KG%%
Si%la%J?K&I,%à%'8B"7*'"4:6%%égal,%la%/;<&I&
%
Un%nouvel%état%d’équilibre%s’établit:%
" Le%5+,69%%dans%le%#+9(427"9%37&5%"3%6D%46-9%37%%
" La%(2%**"+3&'43*&,L01%(PVC)%46-9%37%%
" Le%2%7+62&5%"3%6D%=%(M/NJ?K)%46-9%37%%
%
@+62B%&'%&C+3#7"+3*'"4:6%&E&
%
Par%ailleurs,%si%/01H%→%le%'8B"7*'"4:6%H%:%,+"&'%&!243O&K742,"3-&
La%#+62B%&'%&!243OPK742,"3-%est%appelée%"#+62B%&'%&C+3#7"+3*'"4:6%"%et%décrit%la%2%,47"+3%entre%
(28#$42-%%et%#+3724#7","78%
Ici%la%/01%(PVC)%représente%la%(2%**"+3&'%&2%9(,"**4-%&'6&?1%en%'"4*7+,%.%La%/01%estime%donc%la%(28#$42-%&
5%372"#6,4"2%&'2+"7%%
%
%
%