1.CONSUMER PRICE INDEX (CPI)-panukat ng average sa pagbabago ng presyo ng mga produkto o bilihin na karaniwang kinokonsumo ng mamimili.
*Antas ng pagbabago ng CPI=bagong CPI-dating CPI/dating CPIx100
*halimbawa:CPI 2000=100 CPI 2001=149
~ antas ng pagbabago ng CPI=149-100/100x100=49%
2. GANAP NA ELASTIKO-pagtaas ng demand kapag bumababa ang presyo.
*Σp=Q2-Q1/Q1+Q2/2/P2-P1/P1+P2/2
Q1=200 pcs. biscuits P1=10/pcs.
Q2=125 pcs. biscuits P2=14/pcs.
*125-200/200+125/2/14-10/10+14/2
=-75/325/2/4/24/2
=-75/162.5/4/12
=-75/162.5*12/4
=-900/650
=/-1.38/
=1.38-elastiko
3. IMPLASYON-ang patuloy na pagtaas ng pangkahalatang presyo ng mga bilihin.
*Inflation rate=CPI noon - CPI ngayon /CPI ngayon x100
halimbawa:
2007=202.416, 2008=211.080
inflation rate=211.080-202.416/202.416x100
=8.664/202.416x100
=0.0428x100
=4.28%
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