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  ______    ______   __   _     _____     _  _   
 /_____//  /_   _// | || | ||  |  ___||  | \| || 
 `____ `    -| ||-  | '--' ||  | ||__    |  ' || 
 /___//     _| ||_  | .--. ||  | ||__    | .  || 
 `__ `     /_____// |_|| |_||  |_____||  |_|\_|| 
 /_//      `-----`  `-`  `-`   `-----`   `-` -`  
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發送短信 : Low-price guarantees and pricing behavior: evidence from hypermarkets in Korea