Strikes and Holdouts in Wage Bargaining: Theory and Data

We develop a private-information model of union contract negotiations in which disputes signal a firm's willingness to pay. Previous models have assumed that all labor disputes take the form of a strike. Yet a prominent feature of U.S. collective bargaining is the holdout: negotiations often continue without a strike after the contract has expired. Production continues with workers paid according to the expired contract. We analyze the union's decision to strike or hold out and highlight its importance to strike activity. Strikes are more likely to occur after a drop in the real wage or a decline in unemployment.Bargaining; Signaling; U.S. Wage Negotiations

The Use of Replacement Workers in Union Contract Negotiations: The U.S. Experience, 1980-1989

It is argued in many circles that a structural change occurred in U.S. collective bargaining in the 1980s. Strike incidence declined, dispute incidence increased, and the composition of disputes shifted away from strikes and toward holdouts. We investigate the extent to which the hiring of replacement workers can account for these changes. For a sample of over 300 major strikes since 1980, we estimate the likelihood of replacements being hired. We find that the risk of replacement is lower for bargaining units with more experienced workers, and declines during tight labor markets. The composition of disputes shifts away from strikes as the predicted risk of replacement increases. In addition, the overall level of disputes increases as a result of the shift in the composition of disputes. Based on our estimates reducing the predicted replacement risk faced by bargaining units to the pre-1982 levels would have lead to a reduction in the dispute incidence by around 5 percentage points, an increase in the fraction of disputes involving a strike by around 4 percentage points, and an increase in the strike incidence by around 0.8 percentage points.Collective Bargaining; Strikes; Holdouts

The Use of Replacement Workers in Union Contract Negotiations: The U.S. Experience, 1980-1989

It is argued in many circles that a structural change occurred in U.S. collective bargaining in the 1980s. We investigate the extent to which the hiring of replacement workers can account for this change. For a sample of over 300 major strikes since 1980, we estimate the likelihood of replacements being hired. We find that the risk of replacement declines during tight labor markets, and is lower for bargaining units with more experienced workers. We use the predicted replacement risk as an explanatory variable in a model of the union's choice between the strike and holdout threat. We find that strike usage decreases significantly as the predicted replacement risk increases. We estimate that a ban on the use of replacement workers would have increased strike incidence from 1982-1989 by 3 percentage points, a 30 percent increase.

The Effect of Collective Bargaining Legislation on Strikes and Wages

Using Canadian data on large, private-sector contract negotiations from January 1967 to March 1993, we find that wages and strikes are substantially influenced by labor policy. In particular, we find that prohibiting the use of replacement workers during strikes is associated with significantly higher wages, and more frequent and longer strikes. This is consistent with private information theories of bargaining. We estimate the welfare consequences of a ban on replacement workers, as well as other labor policies. Despite the higher dispute costs, union workers are better off with a ban on replacement workers. The higher wage more than compensates for the more frequent and longer strikes.

Wage Bargaining with Time-Varying Threats

We study wage bargaining in which the union is uncertain about the firm's willingness to pay and threat payoffs vary over time. Strike payoffs change over time as replacement workers are hired, as strikers find temporary jobs, and as inventories or strike funds run out. We find that bargaining outcomes are substantially altered if threat payoffs vary. If dispute costs increase in the long-run, then dispute durations are longer, settlement rates are lower, and wages decline more slowly during the short-run (and may even increase). The settlement wage is largely determined from the long-run threat, rather than the short-run threat

The Determinants of U.S. Labor Disputes

We present a bargaining model of union contract negotiations, in which the union decides between two threats: the union can strike or continue to work under the expired contract. The model makes predictions about the level of dispute activity and the form the disputes take. Strike incidence increases as the strike threat becomes more attractive, because of low unemployment or a real wage drop during the prior contract. We test these predictions by estimating logistic models of dispute incidence and dispute composition for U.S. labor contract negotiations from 1970 to 1989. We find empirical support for the model's key predictions, but these associations are weaker after 1981

Strikes and Holdouts in Wage Bargaining: Theory and Data

We develop a private-information model of union contract negotiations in which disputes signal a firm’s willingness to pay. Previous models have assumed that all labor disputes take the form of a strike. Yet a prominent feature of U.S. collective bargaining is the holdout: negotiations often continue without a strike after the contract has expired. Production continues with workers paid according to the expired contract. We analyze the union’s decision to strike or hold out and highlight its importance to strike activity. Strikes are more likely to occur after a drop in the real wage or a decline in unemployment

The Combinatorial World (of Auctions) According to GARP

Revealed preference techniques are used to test whether a data set is compatible with rational behaviour. They are also incorporated as constraints in mechanism design to encourage truthful behaviour in applications such as combinatorial auctions. In the auction setting, we present an efficient combinatorial algorithm to find a virtual valuation function with the optimal (additive) rationality guarantee. Moreover, we show that there exists such a valuation function that both is individually rational and is minimum (that is, it is component-wise dominated by any other individually rational, virtual valuation function that approximately fits the data). Similarly, given upper bound constraints on the valuation function, we show how to fit the maximum virtual valuation function with the optimal additive rationality guarantee. In practice, revealed preference bidding constraints are very demanding. We explain how approximate rationality can be used to create relaxed revealed preference constraints in an auction. We then show how combinatorial methods can be used to implement these relaxed constraints. Worst/best-case welfare guarantees that result from the use of such mechanisms can be quantified via the minimum/maximum virtual valuation function

Mechanism Design for Perturbation Stable Combinatorial Auctions

Motivated by recent research on combinatorial markets with endowed valuations by (Babaioff et al., EC 2018) and (Ezra et al., EC 2020), we introduce a notion of perturbation stability in Combinatorial Auctions (CAs) and study the extend to which stability helps in social welfare maximization and mechanism design. A CA is $\gamma\textit{-stable}$ if the optimal solution is resilient to inflation, by a factor of $\gamma \geq 1$, of any bidder's valuation for any single item. On the positive side, we show how to compute efficiently an optimal allocation for 2-stable subadditive valuations and that a Walrasian equilibrium exists for 2-stable submodular valuations. Moreover, we show that a Parallel 2nd Price Auction (P2A) followed by a demand query for each bidder is truthful for general subadditive valuations and results in the optimal allocation for 2-stable submodular valuations. To highlight the challenges behind optimization and mechanism design for stable CAs, we show that a Walrasian equilibrium may not exist for $\gamma$-stable XOS valuations for any $\gamma$, that a polynomial-time approximation scheme does not exist for $(2-\epsilon)$-stable submodular valuations, and that any DSIC mechanism that computes the optimal allocation for stable CAs and does not use demand queries must use exponentially many value queries. We conclude with analyzing the Price of Anarchy of P2A and Parallel 1st Price Auctions (P1A) for CAs with stable submodular and XOS valuations. Our results indicate that the quality of equilibria of simple non-truthful auctions improves only for $\gamma$-stable instances with $\gamma \geq 3$

Staphylococcus epidermidis glucose uptake in biofilm versus planktonic cells

The aim of this work was to compare the glucose uptake of biofilms formed by four different Staphylococcus epidermidis strains as well as to compare between sessile and planktonic cells of the same strain. Biofilm cells showed a lower level of glucose uptake compared to planktonic cells. Moreover, glucose uptake by cells in the sessile form was strongly influenced by biofilm composition. Therefore, this work helps to confirm the phenotypic variability of S. epidermidis strains and the different behaviour patterns between sessile and free cells.Fundação para a Ciência e a Tecnologia (FCT) - POCTI/ESP/42688/2001; SFRH/BD/19265/2004