This book investigates the impact of economic deregulation on New Zealand's international trade performance across two distinct periods: pre-deregulation (1970-1985) and post-deregulation (1985-1993). It aims to quantify and analyze the changes in trade patterns, competitiveness, and overall economic outcomes resulting from significant policy shifts. The authors, Paul McKeown and Ralph G. Lattimore, likely draw upon extensive economic data and trade statistics to build their case.

This work appears to be a focused academic or policy-oriented analysis of a specific period in New Zealand's economic history. The detailed timeframe and subject matter suggest a text intended for economists, historians, and policymakers interested in the effects of deregulation. Its value likely lies in its empirical data and analytical approach to understanding trade dynamics.