Please use this identifier to cite or link to this item:
Aruga, Kentaka
Year of Publication: 
[Journal:] Cogent Economics & Finance [ISSN:] 2332-2039 [Volume:] 2 [Year:] 2014 [Issue:] 1 [Pages:] 2-11
This paper examines how efficiently the price premium for non-genetically modified (non-GM) soybeans at the Tokyo Grain Exchange (TGE) reacts to an announcement to change the contract unit, suppliers, and expiration date on the conventional soybean futures contract. An intervention analysis is used for this purpose. The results reveal that the price premium for non-GM soybeans increases after the change and this effect did not disappear immediately. This implies that the two soybean futures markets did not respond quickly to the announcement and there was an informational inefficiency after the announcement. The TGE non-GM soybean futures market is one of the first segregated markets for a non-GM commodity. An intervention of clearing houses on such newly opened markets can often lead to market inefficiency so a further study is necessary in order to understand what causes such inefficiency and to find out how clearing houses can minimize the effects of intervention.
price premium
non-genetically modified soybeans
intervention analysis
Persistent Identifier of the first edition: 
Creative Commons License:
Document Type: 

Files in This Item:

Items in EconStor are protected by copyright, with all rights reserved, unless otherwise indicated.