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This paper reports on recurring laboratory elections in which buyers and sellers choose institutional rules to govern a subsequent trading round. The bid auction (buyers propose prices), offer auction (sellers suggest prices) and double auction (both trader types initiate price quotes) make up the electoral candidates. Both plurality rule and approval voting are used as vote-counting schemes. The former allows each trader to vote for at most one auction, whereas approval voting permits voters to either abstain or to vote for one, two or all three institutional alternatives. The main result is threefold.First, plurality rule induces a Duverger effect in the sense that just the bid and offer auction emerge as viable auctions. Approval voting instead leads to close three-way races with each of the three auctions winning approximately one third of the elections. Second, buyers (sellers) in the plurality rule sessions concordantly vote for the bid (offer) auction. Approval voting behavior is comparatively more heterogeneous. Third, bid auction prices are significantly lower than double auction prices, which again are significantly below offer auction prices.

This paper reports on recurring laboratory elections in which buyers and sellers choose institutional rules to govern a subsequent trading round. The bid auction (buyers propose prices), offer auction (sellers suggest prices) and double auction (both trader types initiate price quotes) make up the electoral candidates. Both plurality rule and approval voting are used as vote-counting schemes. The former allows each trader to vote for, at most, one auction, whereas approval voting permits voters to either abstain or to vote for one, two or all three institutional alternatives. The main result is threefold. First, plurality rule induces a Duverger effect in the sense that only the bid and offer auctions emerge as viable auctions. Approval voting instead leads to close three-way races with each of the three auctions winning approximately one third of the elections. Second, buyers (sellers) in the plurality-rule sessions concordantly vote for the bid (offer) auction. Approval-voting behavior is comparatively more heterogeneous. Third, bid-auction prices are significantly lower than double-auction prices, which again are significantly below offer-auction prices.

We analyse voter turnout as a function of referendum types. An advisory referendum produces advice that a legislature may or may not take into account when choosing between two alternatives, whereas a binding referendum generates a decisive decision. In theory, voter turnout should be higher under binding than advisory referendums, higher in small than large electorates and higher in close than less close referendums. These predictions are corroborated by evidence from 230 local referendums in Norway. For example, a shift from an advisory to a semi-binding referendum leads to an average increase in voter turnout by 11.5 percentage points.