Page 313 - NGTK2018

Where:
pi

t t 1
: Gold or USD price index in the reference month (t) compared to the
i
previous month (t-1);
t
P : Average gold or USD price in the reference month (t);

i
t 1
P : Average gold or USD price in the previous month (t-1).
i
Gold price index and USD price index are computed monthly by the following
comparative bases: base year, previous month, same month of the last year, last
December and periodical average for every province/city directly under the central
government.
Average consumer price of some goods and services in the local area is the
amount of money that consumers spend to buy a unit of goods or service to serve for
daily life. Consumer price is shown by the retail price of goods in market or the
price of services for people’s livings (including VAT). In case that the prices of
goods and services are not marked and consumers can bargain, the consumer price is
the final price of goods paid by consumers in market after negotiation with sellers.
Formula for computing average consumer price is as follows:
 M ,K  1 ( / N )
P    (P ,k 
)
i i , j
 j  , 1 k  1 
Where:
i P : Average price in the reference month of item i;
Pi,j,k: Surveyed price of item i at place j, period k;
K: Number of survey periods of item i in the reference month, K = 1÷3;
k: The survey period of item i, k = 1÷K;
M: Number of survey places of item i in the reference month;
j: Survey place of item i in period k in reference month, j = 1 ÷M;
N: Number of samples of item i’s price collected in the reference
month, N = M x K.

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