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Export Reference (APA) 
Grzybowski, L. & Pereira, P. (2008). The complementarity between calls and messages in mobile telephony. Information Economics and Policy. 20 (3), 279-287
Export Reference (IEEE) 
L. Grzybowski and J. P. Pereira,  "The complementarity between calls and messages in mobile telephony", in Information Economics and Policy, vol. 20, no. 3, pp. 279-287, 2008
Export BibTeX 
@article{grzybowski2008_1773394150014,
	author = "Grzybowski, L. and Pereira, P.",
	title = "The complementarity between calls and messages in mobile telephony",
	journal = "Information Economics and Policy",
	year = "2008",
	volume = "20",
	number = "3",
	doi = "10.1016/j.infoecopol.2008.06.005",
	pages = "279-287",
	url = "https://www.sciencedirect.com/journal/information-economics-and-policy"
}
Export RIS 
TY  - JOUR
TI  - The complementarity between calls and messages in mobile telephony
T2  - Information Economics and Policy
VL  - 20
IS  - 3
AU  - Grzybowski, L.
AU  - Pereira, P.
PY  - 2008
SP  - 279-287
SN  - 0167-6245
DO  - 10.1016/j.infoecopol.2008.06.005
UR  - https://www.sciencedirect.com/journal/information-economics-and-policy
AB  - This article estimates price elasticities of demand for mobile telephone calls and messages. We use panel data consisting of telephone bills to Portuguese mobile telephony consumers. In order to account for the unobserved individual heterogeneity and data censoring, we estimate a Tobit model for panel data with individual random effects. The demands for calls and messages are inelastic. Calls and messages are found to be complements.
ER  -