Table 1. Studies included in meta-regression analysis.
| Year | Authors | Journal | Country of research | Total number of participants | Type of product | WTP $/lb |
|---|---|---|---|---|---|---|
| 2002 | Loureiro, Hine [24] | Journal of Agricultural and Applied Economics | US | 437 | Potatoes | $0.93 |
| 2003 | Alfnes, Rickertsen [100] | American Journal of Agricultural Economics | Norway | 106 | Beef | $1.06 |
| 2006 | Stefani et al. [13] | Food Quality and Preference | Italy | 77 | Spelt | $0.17 |
| 2007 | Arnoult et al. [23] | International Marketing and International Trade of Quality Food Products | UK | 222 | Lamb chops | $1.41 |
| Strawberries | $1.55 | |||||
| 2008 | Darby et al.. [15] | American Journal of Agricultural Economics | US | 530 | Strawberries | $0.45; $0.79 |
| 2008 | Thilmany et al. [18] | American Journal of Agricultural Economics | US | 1,549 | Melons | $0.021 |
| 2009 | Hu et al. [38] | Journal of Agricultural and Applied Economics | US | 557 | Pure blueberry jam | $2.33 |
| Blueberry-lime jam | $3.52 | |||||
| Blueberry yogurt | $0.65 | |||||
| Blueberry dry muffin mix | $2.51 | |||||
| Blueberry raisinettes | $6.56 | |||||
| 2009 | Yue, Tong [48] | HortScience | US | 343 | Tomatoes | $0.67; $0.73 |
| 2011 | Costanigro et al. [22] | Agribusiness | US | 300 | Apples | $1.18 |
| 2011 | Nganje et al. [35] | Agricultural and Resource Economics Review | US | 315 | Spinach | $0.18 |
| Carrots | $0.10 | |||||
| 2011 | Onozaka, Thilmany-McFadden [26] | American Journal of Agricultural Economics | US | 1,052 | Apples | $0.22 |
| Tomatoes | $0.38 | |||||
| 2012 | Hu et al. [17] | European Review of Agricultural Economics | US | 1,884 | Blackberry jam | $0.29; $0.33; $0.41; $0.29; $0.19 |
| 2012 | Sanjuán et al. [44] | Appetite | Spanish regions, French regions | 1,219 | Beef | $0.42; $0.65; $0.43; $0.40 |
| 2013 | Grebitus et al. [20] | Ecological Economics | Germany | 47 | Apple | $0.38 |
| Wine | $0.84 | |||||
| 2013 | Illichmann, Abdulai [37] | German Gewisola conference | Germany | 1,182 | Apples | $0.14 |
| Milk | $0.38 | |||||
| Beef | $1.84 | |||||
| 2013 | Lopez-Galan et al. 41] | Spanish Journal of Agricultural Research | Spain | 803 | Eggs | $1.36; $0.48 |
| 2014 | Boys et al. [36] | Environment, Development and Sustainability | Commonwealth of Dominica | 188 | Produce | $0.11 |
| 2014 | Gracia [101] | Empirical Economics | Spain | 133 | Lamb meat | $0.71 |
| 2014 | deMagistris, Gracia [102] | International Journal of Consumer Studies | Spain | 171 | Untoasted almonds | $4.09 |
| 2014 | Meas, Hu [30] | Southern Agricultural Economics Association Annual Meeting | US | 778 | Tilapia | $3.83; $5.25 |
| 2015 | Adalja et al. [32] | Agricultural and Resource Economics Review | US | 685 | Ground beef | $1.21; $0; $2.72; $2.39; $1.47 |
| 2015 | Bosworth et al. [29] | Journal of Food Products Marketing | US | 259 | Ice cream | $0.20; $0.16 |
| 2015 | Hasselbach, Roosen [12] | Journal of Food Products Marketing | Germany | 720 | Bread | $0.45; $0.29 |
| Beer | $0; $0.37 | |||||
| Milk | $0.24; $0.29 | |||||
| 2015 | Meas et al. [39] | American Journal of Agricultural Economics | US | 1,883 | Blackberry jam | $0; $0.25; $0.41; $0.27; $0.42 |
| 2016 | Wägeli et al. [11] | International Journal of Consumer Studies | Germany | 597 | Milk | $0.69; $0.32 |
| Pork cutlets | $2.77; $2.65 | |||||
| Eggs | $1.39; $1.08 | |||||
| 2016 | Dobbs et al. [103] | Journal of Food Distribution Research | US | 676 | Boneless ribeye steak | $5.06 |
| Ground beef | $1.66 | |||||
| 2016 | Sackett et al. [91] | International Journal of Food and Agricultural Economics | US | 1002 | Apple | $0.51 |
| Steak | $2.29 | |||||
| 2016 | Willis et al. [65] | Journal of Agricultural and Applied Economics | US | 340 | Produce | $0.17 |
| Animal product | $0.33 | |||||
| 2017 | Bazzani et al. [104] | Food Quality and Preference | Italy | 80 | Applesauce | $3.40 |
| 2017 | Mugera et al. [105] | Journal of Food Products Marketing | Australia | 333 | Fruit yogurt | $1.19 |
| Skinless chicken breast | $1.26 | |||||
| 2017 | Gumirakiza et al. [106] | Journal of food products marketing | US | 819 | Peaches | $2.30 |
| Yellow squash | $3.30 | |||||
| Eggplant | $2.90 | |||||
| 2018 | Byrd et al. [107] | Journal of Food Products Marketing | US | 825 | Pork chops | $2.04 |
| Chicken breast | $1.01 | |||||
| 2018 | Li et al. [108] | Journal of Agricultural and Applied Economics | US | 1688 | Steak Beef | $2.59 |
| Ground beef | $0.95 | |||||
| 2018 | Merritt et al. [109] | Journal of Agricultural and Applied Economics | US | 408 | Beef steak | $2.42 |
| Ground beef | $1.15 | |||||
| 2018 | Printezis, Gebitus [110] | Ecological Economics | US | 1046 | Tomatoes | $0.80; $0.85 |
Note: WTP represents the price premium that consumers are willing to pay for the “local” attribute compared to unlabeled origin food.