RPIX

Background

The Retail Price Index excluding Mortgage Interest Payments (RPIX) is an economic measure used to track the changes in the cost of a prescribed basket of goods and services, akin to the standard Retail Price Index (RPI). The key difference lies in the exclusion of mortgage interest payments from RPIX.

Historical Context

The introduction of the RPIX arose from the need to better understand inflation trends without the volatility introduced by changing mortgage interest rates. In the UK, the RPIX has been utilized as a means to achieve a clearer picture of the inflationary environment, particularly in policy contexts where mortgage interest payments could distort economic assessments.

Definitions and Concepts

RPIX is defined as a measure of inflation that excludes the cost of mortgage interest payments. This is contrasted with the RPI, which includes mortgage interest payments. The main reasoning behind RPIX is the minimization of distortion brought about by interest rate changes.

Key Points:

RPIX: Retail Price Index excluding Mortgage Interest Payments.
RPI: Retail Price Index including Mortgage Interest Payments.
Volatility: The inclusion of mortgage payments in the RPI can lead to more volatility in the index.

Major Analytical Frameworks

Various schools of economic thought approach RPIX differently.

Classical Economics

Classical economists believe that the market determinism and self-regulation principles warrant using RPIX for its predictive clarity under rational market trends.

Neoclassical Economics

For neoclassical economists, the exclusion of mortgage costs in RPIX better reflects the real cost of living by excluding one-time interest rate impacts.

Keynesian Economics

Keynesians might support RPIX’s role in understanding inflation while recognizing the wage-price spirals that include significant housing costs.

Marxian Economics

Marxist perspectives may critique both indices for omitting relevant social dimensions, but acknowledge the analytical flatness RPIX provides on commodity costs excluding housing finance distortions.

Institutional Economics

Institutional economists consider the practicality of RPIX within policy circles where housing subsidization or intervention makes RPIX a clearer inflation measure.

Behavioral Economics

Behavioral economics would study the differences in consumer behavior and perception with and without mortgage interest, providing insights into how RPIX might better reflect actual consumer sentiment.

Post-Keynesian Economics

Post-Keynesians find value in RPIX for its stability and application in demand-management policies without concealing the real burden of housing costs for consumers.

Austrian Economics

Austrians prefer RPIX for its alignment with hard cost of goods and services, independent of financial sector oscillations, hinting at a truer capture of monetary purchasing power.

Development Economics

From a development economics perspective, RPIX might be more suitable for countries undergoing mortgage policy transitions, thus providing a clearer economic outlook.

Monetarism

Monetarists favor RPIX because it offers a more direct read on money supply impacts on prices without the noise of housing finance alterations.

Comparative Analysis

RPI vs RPIX: RPI includes mortgage interest payments, thus can be more volatile in response to changes in interest rates. RPIX reflects a more stable and pure measure of inflation.

Case Studies

UK Inflation Measurement: Instances when interest rates rise to combat inflation highlighting RPI-sensitivity vs the stability offered by RPIX.

Suggested Books for Further Studies

“Statistics for Economics Accounting and Business Studies” by Michael Barrow
“Principles of Economics” by N. Gregory Mankiw
“Inflation and Public Policy” by Assar Lindbeck

Retail Price Index (RPI): An index measuring changes in the cost of a fixed basket of goods and services that includes mortgage interest payments.
Consumer Price Index (CPI): An index measuring changes in the retail prices of a basket of goods and services, similar to RPI but excludes mortgage interest and other housing costs generally.
Inflation: The rate at which the general level of prices for goods and services rises, eroding purchasing power.

By leveraging this structure, one can provide a comprehensive view of RPIX, applicable frameworks, and real-world relevance, ensuring nuanced comprehension and analytical depth.