examples: solo-swan economic growth model

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+model SolowSwan
+    "Simple economic growth model"
+    Real Y "total production";
+    Real K "capital factor";
+    Real L "labor factor";
+    Real A "labor-augmentation factor";
+    parameter Real L_0=1 "initial labor";
+    parameter Real A_0=1 "initial labor augmentation";
+    parameter Real alpha "elasticity of output with respect to capital (0 to 1)";
+    parameter Real n "labor (population) growth rate";
+    parameter Real g "augmentation growth rate";
+    parameter Real delta "rate of capital deprecation";
+    parameter Real c "consumption vs. investment fraction (0 to 1)";
+equation
+    Y = K^alpha * (A * L)^(1-alpha);
+    L = L_0 * e^(n*t);
+    A = A_0 * e^(g*t);
+    der(K) = (1-c)*Y - delta*K;
+end SolowSwan;