Add first experiment

Author: benjaminaaron

dev/dev.py

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+from openfisca_core.simulation_builder import SimulationBuilder
+from openfisca_germany import CountryTaxBenefitSystem
+
+system = CountryTaxBenefitSystem()
+
+population = {
+    "persons": {
+        "Alice": {
+            "salary": { "2025-07": 5000 },
+        },
+        "Bob": {
+            "salary": { "2025-07": 3000 },
+        }
+    }
+}
+
+sim = SimulationBuilder().build_from_entities(system, population)
+print(sim.calculate("dev_benefit", "2025-07"))

openfisca_germany/parameters/benefits/dev_multiplier.yaml

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+description: Multiplier for the dev benefit
+metadata:
+  reference: https://example.org/simple-benefit
+
+values:
+  2025-01-01:
+    value: 2.0

openfisca_germany/variables/dev_benefit.py

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+from openfisca_core.periods import MONTH
+from openfisca_core.variables import Variable
+from openfisca_germany.entities import Person
+
+class dev_benefit(Variable):
+    value_type = float
+    entity = Person
+    definition_period = MONTH
+    label = "Dev benefit"
+    reference = "https://example.org/simple_benefit"
+
+    def formula(person, period, parameters):
+        salary = person("salary", period)
+        multiplier = parameters(period).benefits.dev_multiplier
+        return salary * multiplier