Realism and Liberalism are two rival theories in IR. The theorists from these different camps disagree on many issues, but when it comes to the correlation between security and economic interdependence, they tend to agree, although the causal directions they may have in mind are different. In the following, Realist theory considers that there are two âequilibriaâ or stable states of affairs: (1) insecurity combined with low economic interdependence (I call this a âfirst Realist equilibriumâ or âRealist equilibrium Iâ) and (2) security combined with high economic interdependence (I call this a âsecond Realist equilibriumâ or âRealist equilibrium IIâ).
On the other hand, Liberal theory tends to focus on the latter combination: high economic interdependence combined with security. If this is called a âLiberal equilibriumâ, it is the same as the second Realist equilibrium or Realist equilibrium II. Thus, in the interests of time, I use the term âRealist equilibriumâ to denote the first Realist equilibrium, and the term âLiberal equilibriumâ to denote both the Liberal equilibrium and the second Realist equilibrium at the same time.
1.2.1 Realist predictions
In the following, I will show that Realist theory predicts that security tensions (i.e. the presence of insecurity) lead to low economic interdependence and lack of such tensions leads to high economic interdependence. Thus, Realists predict two contrasting situations: (1) adversaries or potential rivals having low economic interdependence with each other (Equilibrium I) and (2) allies and other very friendly states having high economic interdependence (Equilibrium II).
An essential element in any Realist theory is that âsecurityâ is a paramount concern of states. For example, by quoting Carr (1964, 109) (âPotential war [is] a dominant factor in international politicsâ), Kirshner (1999, 72) argues that Realism dictates that âstates must anticipate the possibility of warâ. Here, security means absence of war or other deadly rivalry, and insecurity means the opposite. Thus, when insecurity prevails among states, states must prepare for possible war or other militarized conflicts.
Because Realists see a long-run harmony between power and plenty (Viner 1948), economic policy is also guided not solely by the quest for economic welfare, but by the quest for wealth that will contribute to state power and hence security. Kirshner (1999, 71) says that âindustrial capacity, access to raw materials, and assurance of adequate financeâ all favour increasing state power.
Thus, Gowa and Mansfield (1993, 408) predict the following:
[T]he absence of a supranational authority in the international system enables a state to resort to force at any time to achieve its goals. The probability that a state will do so depends in part upon its power, which, in turn, depends partly upon its real income.
Gowa (1989, 1994) coined the term âsecurity externalitiesâ to describe the fact that statesâ economic policy is guided by security concerns. âExternalitiesâ is a term economists use to describe a phenomenon like pollution where an agentâs activity affects others as an âunintendedâ consequence. The economic policy of a state may have such âexternalitiesâ in terms of security because economic policy naturally has an impact on oneâs wealth, which is indirectly related to power and security. One stateâs economic policy may affect wealth and power of other states, with natural consequences for their security. Gowaâs notion of âexternalitiesâ, however, is slightly different from that of economists because, in economic theory, profit-seeking firms are not presumed to care about externalities (they pollute unless they are regulated). Gowa, in contrast, assumes that states are fully aware of âsecurity externalitiesâ and conduct their business accordingly. Allies, which gain from each otherâs increasing income and power, tend to trade with each other, for example (Gowa and Mansfield 1993; Gowa and Mansfield 2004 for industries with economies of scale).
Expanding on Gowaâs theory of âsecurity externalitiesâ, SkĂ„lnes (2000) argues that using various instruments such as trade, aid, and finance, states engage in discriminatory foreign economic policies. This is because if the trade partner is oneâs ally, one needs its support in case of war or international crises, and the greater the power of the ally, the more beneficial it is for the allyâs partner.4 According to SkĂ„lnes, discriminatory policies are particularly geared towards benefiting allies and hurting adversaries.
In combination, these theories suggest the following scenarios. Between two rival states, which have serious disputes with each other and have a possibility of militarized conflict, economic interdependence will be low because states will prevent trade and financial flows that will contribute to their rivalsâ power and plenty. On the other hand, between two friendly states, these adversarial intentions do not exist; trade and investment flows prosper between these states, leading to a high degree of economic interdependence (Dixon and Moon 1993).
In sum, Realists predict two contrasting pairs of states: (1) between adversaries, high security tensions and low economic interdependence; (2) between friends, low security tensions and high economic interdependence. Between allies, insecurity is low because they are supposed to cooperate in each otherâs security affairs, and quite high economic interdependence will follow.
Incidentally, Realists admit that private economic agents may have divergent interests from states. SkĂ„lnes says, âEconomic interest groups ⊠seek to influence policy-making to maximize their own economic welfareâ (p. 20). Thus, â[p]rivate domestic interests ⊠may constrain a governmentâs ability to develop grand strategies that accurately reflect strategic assessmentsâ (p. 21).
However, Realists have two answers to this problem. First, states may nevertheless take discriminatory economic policies in such a way that they guide private economic activities to be more in line with state interests. In particular, these discriminatory policies may be particularly useful between allies. SkĂ„lnes calls it â âtied handsâ: policymakers may adopt discriminatory policies to shore up domestic support for an alliance in the allyâ (p. 22).
Another Realist response is the âfollow the flagâ hypothesis: private economic agents act according to the mood of the time.5 Pollins (1989a, 1989b) showed that imports react very sensitively to cooperation between nations: the friendlier the pair of states concerned is, the more trade is conducted. Conversely, conflict suppresses trade (Keshk, Pollins and Reuveny 2004).6 Pollins attributed this empirical finding to risk avoidance and/or patriotism of private agents. First, âthe buyer could choose a seller from a friendly nation in order to minimize the possibility of economic disruptionâ (1989a, 741, italics in the original). Alternatively, consumers in the importing nations may have a strong sense of patriotism, which endorses the policy of their state towards friends and foes: âconsumers may wish to express goodwill or solidarity toward those whom they identify as friends, while shunning or punishing those they perceive as foesâ (p. 740).7 If either or both of these suppositions are correct, they will predict a strong negative correlation between security tensions and interdependence between a given pair of states. Between allies, high interdependence develops, and between potential and actual adversaries, interdependence remains low. The result is the same as explained above: both Equilibria I and II obtain.