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We study a situation where, as a consequence of private information, agents do not have the incentive to invest in a public good if they are unable to have prior discussion with their partners. We show that in a voluntary contribution mechanism with cheap talk, any finite message space does not provide efficiency gain relative to a binary message space when agents truthfully report their type. Using laboratory experiments, we observe that communication is a useful mechanism to enhancedoi:10.2139/ssrn.2029331 fatcat:dyxuasm34vcxpdzbgfvoedquby