2. Modelning asosiy tenglamalari is egri chizig’i va uning tenglamasi

 

3. IS - egri chizig’i va uning tenglamasi 

IS-egri  chizig’i  tovarlar  xizmatlar bozorida  foiz  stavkasi  R  va  daromadlar  darajasi Y  ning 

kombinatsiyalarini  xarakterlovchi,  bir  vaqtning  o’zida  asosiy  makroiqtisodiy  ayniyat,  iste’mol, 

investitsiya  va  sof  eksport  funktsiyalari  qondiriladigan  nuqtalarning  geometrik  joylashuvini  

xarakterlaydi.  Bu  egri  chiziqning  har  bir  nuqtasida  investitsiyalar  va  jamg’armalar  o’zaro  teng 

bo’ladi. 

IS-egri  chizig’ini  Keyns  xochi  va  investitsiya  funktsiyasi  grafigi  yordamida  keltirib 

chiqarish mumkin. (23-,24-, va25-chizmalar.) 

                                                      E                                         E=Y                                                                                                                                                                                                                                                                           

                                                                                                          E

1

 

                                                    

                                                                                         

                                                                   ΔI                                       E

2 = 

E

1 - 

ΔE(ΔI)