Maximum value for `MultiplierUpdate` (#6021)

* update multiplier

* fix

* update lockfile for {"substrate"}

* fmt

* fix typo

Co-authored-by: parity-processbot <>

polkadot/runtime/common/src/lib.rs

@@ -52,6 +52,7 @@ pub use pallet_balances::Call as BalancesCall;
 pub use pallet_staking::StakerStatus;
 pub use pallet_timestamp::Call as TimestampCall;
 use pallet_transaction_payment::{Multiplier, TargetedFeeAdjustment};
+pub use sp_runtime::traits::Bounded;
 #[cfg(any(feature = "std", test))]
 pub use sp_runtime::BuildStorage;
 
@@ -87,6 +88,8 @@ parameter_types! {
 	/// that combined with `AdjustmentVariable`, we can recover from the minimum.
 	/// See `multiplier_can_grow_from_zero`.
 	pub MinimumMultiplier: Multiplier = Multiplier::saturating_from_rational(1, 10u128);
+	/// The maximum amount of the multiplier.
+	pub MaximumMultiplier: Multiplier = Bounded::max_value();
 	/// Maximum length of block. Up to 5MB.
 	pub BlockLength: limits::BlockLength =
 	limits::BlockLength::max_with_normal_ratio(5 * 1024 * 1024, NORMAL_DISPATCH_RATIO);
@@ -94,8 +97,13 @@ parameter_types! {
 
 /// Parameterized slow adjusting fee updated based on
 /// https://research.web3.foundation/en/latest/polkadot/overview/2-token-economics.html#-2.-slow-adjusting-mechanism
-pub type SlowAdjustingFeeUpdate<R> =
-	TargetedFeeAdjustment<R, TargetBlockFullness, AdjustmentVariable, MinimumMultiplier>;
+pub type SlowAdjustingFeeUpdate<R> = TargetedFeeAdjustment<
+	R,
+	TargetBlockFullness,
+	AdjustmentVariable,
+	MinimumMultiplier,
+	MaximumMultiplier,
+>;
 
 /// Implements the weight types for a runtime.
 /// It expects the passed runtime constants to contain a `weights` module.