This paper has two purposes: it introduces the econometric methods used to analyze time series data with general frequency and presents a framework for analyzing economic variables that are measured daily; this special case is then applied to the trading volume of stock markets.

Purpose: The purpose of this paper is to examine the long-term relationship between farm size and productivity in China at the national level. Design/methodology/approach: In contrast to the micro-data examination conducted by earlier literature, in this study, the authors use household...