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6461.0 - Consumer Price Index: Concepts, Sources and Methods, 2011  
Latest ISSUE Released at 11:30 AM (CANBERRA TIME) 19/12/2011   
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CHAPTER 3 HISTORICAL BACKGROUND


INTRODUCTION

3.1 Before the introduction of the Consumer Price Index (CPI) in 1960, there were five series of retail-price indexes compiled by the (then) Commonwealth Bureau of Census and Statistics. Those indexes were as follows:

(i) The A Series Index, covering only food, groceries and housing rents (for all houses), which was first compiled in 1912 with index numbers going back to 1901, was discontinued in 1938. Its main use was for adjusting wages between 1913 and 1933.

(ii) The B Series Index, covering only food, groceries and housing rents (for four and five-roomed houses), which was first compiled in 1925, was discontinued in 1953. It was introduced to replace the A Series Index for general statistical purposes, but was never used for adjusting wages.

(iii) The C Series Index, covering food and groceries, housing rents (for four and five-roomed houses), clothing, household drapery, household utensils, fuel, lighting, urban-transport fares, smoking and some miscellaneous items, which was introduced in 1921, was discontinued in 1961. The food and rent component of the C Series Index was the same as that for the B Series Index. The C Series Index was used to adjust wages from 1934 until it was discontinued.

(iv) The D Series Index, which was derived by combining the A Series and C Series Indexes, and was compiled especially for wage adjustment purposes for a short period in 1933-34.

(v) The Interim Retail Price Index, covering food and groceries, housing rents (for four and five-roomed houses), clothing, household drapery, household utensils, fuel, lighting, urban-transport fares, smoking, and some services and miscellaneous items which was first compiled in 1954 and was discontinued in 1960. As the name implies, the Interim Index was intended to serve as a transitional index, but to some extent it replaced the C Series Index for general statistical purposes for a few years before 1960. It was never used for wage adjustment purposes.


C SERIES INDEX

3.2 By far the most important of these old price indexes was the C Series Index which was the principal retail price index in Australia for almost forty years. It was first compiled in 1921 with index numbers compiled back to 1914. C Series Index numbers were compiled for:

(i) the capital city in each of the six states;

(ii) four of the larger towns in each of the six states;

(iii) weighted average of five towns (including the capital city) in each of the six states;

(iv) weighted average of the six state capital cities;

(v) weighted average of thirty towns (including the capital cities); and

(vi) three additional towns - Whyalla, Port Augusta, and Canberra.

3.3 The C Series Index was reviewed in 1936 and a slightly revised regimen was introduced following that review. The regimen then remained unchanged until the C Series Index was discontinued.

3.4 The main reason for the long interval without any review or change in composition of the C Series Index after 1936 was the recurrent changes in consumption patterns which occurred during and after World War II. It was considered impossible at the time to devise a revised weighting pattern which would be any more representative of post-war consumption than the existing weighting pattern of the C Series Index. The Commonwealth Statistician of the time, in successive editions of the Labour Report during the 1950s and 1960s, explained the absence of any re-weighting of the C Series Index in the following words.

    "From the outbreak of war in 1939 to late in 1948, periodic policy changes in various wartime controls (including rationing) caused recurrent changes in consumption and in the pattern of expenditure. This rendered changes desirable but made it impracticable either to produce a new index, or to revise the old one, on any basis that would render the index more representative than it already was of the changing pattern of household expenditure in those years. When commodity rationing had virtually ceased in the latter part of 1948 action was taken by the Statistician to collect price data of about 100 additional items and to gather information as to current consumption and expenditure patterns. This was done to facilitate review of the component items and weighting system of the C Series Retail Price Index in the light of the new pattern of wage earner expenditure and consumption that appeared to be then emerging. But there supervened, in the next few years, conditions which caused wide price dispersion, coupled with a very rapid rise in prices and a new sequence of changes in consumption and in the pattern of wage earner expenditure. Under these conditions it was not possible to devise any new weighting pattern likely to be more continuously representative of conditions then current, than was the existing C Series Index on the 1936 revision."

3.5 In 1953, the decision was made to continue compiling the C Series Index on its pre-war basis, but also to compile an interim retail price index based as nearly as possible on the post-war pattern of consumer usage and expenditure. Nevertheless, the C Series Index continued to be regarded by the majority of users as the principal official index, and was the one used in most indexation and escalation arrangements throughout the 1950s.


INTERIM RETAIL PRICE INDEX

3.6 The Interim Retail Price Index was based on post-war consumption weights. Compared with the C Series Index, the Interim Index covered an expanded range of items, including additional foods (such as packaged breakfast foods, soft drinks, ice cream, and confectionery) and services (such as dry-cleaning and shoe repairs). Throughout the period of its compilation, no attempt was made to revise its weights to take account of major changes in expenditure patterns and lifestyles that were occurring during the 1950s. During that decade, house renting was substantially replaced by home ownership, the use of motor cars partially replaced the use of public transport, and a variety of electrical appliances, and subsequently television, became widely used by households. During the same period, widely disparate movements occurred in the prices of different items routinely purchased by households. It was considered that the combined effect of these factors made it impracticable to introduce a comprehensive new retail price index during the period to 1960.


CONSUMER PRICE INDEX

3.7 In 1960, a new approach was tried. Instead of the former emphasis on long-term fixed-weighted indexes, the aim was to compile a series of shorter term indexes that would be chain linked to form long-term series. The Consumer Price Index, commonly referred to as the CPI, was the first price index of this kind constructed in Australia.

3.8 The CPI was first compiled in 1960 with index numbers compiled back to mid-1948. Like the old indexes, the CPI was designed to measure quarterly changes in the retail prices of goods and services purchased by metropolitan wage-earning households.

3.9 The CPI has been reviewed and re-weighted fifteen times since then. At its inception in 1960, the CPI consisted of three original series linked together with changes in weights in 1952 and 1956. Weights were changed in 1960 and subsequently in 1963, 1968, 1973, 1974, 1976, 1982, 1987, 1992, 1998, 2000, 2005 and 2011. The method of linking the sequence of short-term price indexes to form one continuous series is described in Chapter 12.


LONG-TERM LINKED SERIES

3.10 To provide an approximate long-term aggregate measure of consumer price change for the period since the first Australian retail price index was compiled, the ABS has constructed a single series of index numbers by linking together selected retail and consumer price index series from amongst those described above (see Table 3.1). The index numbers are expressed with an index reference base of 1945 equals 100.0 which was the end of a period of price stability during World War II. The successive series linked together to produce this long-term series of index numbers are:
  • from 1901 to 1914, the A Series Retail Price Index;
  • from 1914 to 1946-47, the C Series Retail Price Index;
  • from 1946-47 to 1948-49, a combination of the C Series Index, excluding the housing group of the CPI; and
  • from 1948-49 onwards, the CPI.

3.11 This long-term series of index numbers is updated each year. A graph of the series taken from Table 3.1 is presented in Figure 3.1.

3.1 RETAIL/CONSUMER PRICE INDEX NUMBERS(a)(b)

Year
Index
Year
Index
Year
Index
Year
Index

1901
47
1931
78
1961
252
1991
1,898
1902
50
1932
74
1962
251
1992
1,917
1903
49
1933
71
1963
252
1993
1,952
1904
46
1934
73
1964
258
1994
1,989
1905
48
1935
74
1965
268
1995
2,082
1906
48
1936
75
1966
276
1996
2,136
1907
48
1937
78
1967
286
1997
2,141
1908
51
1938
80
1968
293
1998
2,159
1909
51
1939
82
1969
302
1999
2,191
1910
52
1940
85
1970
313
2000
2,289
1911
53
1941
89
1971
332
2001
2,389
1912
59
1942
97
1972
352
2002
2,462
1913
59
1943
101
1973
385
2003
2,530
1914
61
1944
100
1974
443
2004
2,588
1915
70
1945
100
1975
510
2005
2,658
1916
71
1946
102
1976
579
2006
2,753
1917
75
1947
106
1977
650
2007
2,817
1918
80
1948
117
1978
702
2008
2,940
1919
91
1949
128
1979
766
2009
2,994
1920
103
1950
140
1980
844
2010
3,079
1921
90
1951
167
1981
926
2011
(c)
1922
87
1952
196
1982
1,028
1923
89
1953
205
1983
1,132
1924
88
1954
206
1984
1,177
1925
88
1955
211
1985
1,257
1926
90
1956
224
1986
1,370
1927
89
1957
229
1987
1,487
1928
89
1958
233
1988
1,594
1929
91
1959
237
1989
1,714
1930
87
1960
245
1990
1,839

(a) Base: Calendar Year 1945 = 100.0.
(b) The index numbers relate to the weighted average of six state capital cities from 1901 to 1980 and to the weighted average of eight capital cities from 1981. Index numbers are for calendar years.
(c) Data not available at time of publication.


Figure 3.1: Graph of long-term Retail/Consumer Price Index

Diagram: Long-term linked series for the retail and consumer price index from 1901 to 2010


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