Microsoft Word apsa paper VII jen doc



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Bog'liq
Tobin and Busch

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Each of the variables is indexed by countries (i) and/or (j) and time (t).  The dependent 

variable, PTA, is coded 1 the year that a pair of countries, i and j, enter into a trade 

agreement, 1 in each subsequent year, and 0 otherwise. 

The vector d contains a series of dyad-specific characteristics: TRADE (trade 

flows between the dyad partners); DISTANCE (geographic distance between the dyad 

partners); SKILL (skill difference between the dyad partners, as a proxy for the similarity 

of factor endowments); INCOME (difference between the dyad partners’ GDP per capita, 

to gauge the similarity of their economies); and ALLIANCE (membership of the dyad 

partners in a formal alliance). 

The vector z contains a series of country-specific variables that we always include 

for the host country and for purposes of robustness include for the partner country: WTO 

(membership in the World Trade Organization or its predecessor institution, the General 

Agreement on Tariffs and Trade); gross domestic product per capita (a proxy for the 

strength of the economy); POLITY (the country’s level of democracy, as a proxy for and 

political risk); and the natural log of POPULATION (a proxy for the market size of the 

economy). 

The vector r contains a series of regional dummies to capture the possibility of 

unmeasured regional influences on the propensity to form PTAs.  Summary statistics for 

all variables are available in Appendix A. 



 

9

Equation (1) is useful for examining the independent effect of a dyad BIT on a 



PTA, but our theory leads us to believe that this effect may be conditional in two ways.  

First, we expect that the impact of entering into a BIT on the probability of forming a 

PTA depends on the number of investment treaties a host country has signed with other 

developed countries.  Further, the number of BITs a country has is likely to affect the 

probability of forming a PTA, conditional on the number of BITs in force.  These conjec-

tures augment equation (1) as follows: 

 

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